Summary of Significant Accounting Policies	12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies The Company’s significant accounting policies, which have been consistently applied, are as follows: Principles of Consolidation and Basis of Presentation The Company’s consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”). The consolidated financial statements include the accounts of the Company, its subsidiaries and investment products that are consolidated. Voting interest entities ("VOEs") are consolidated when the Company is considered to have a controlling financial interest, which is typically present when the Company owns a majority of the voting interest in an entity or otherwise has the power to govern the financial and operating policies of the entity. See Note 18 for additional information related to the consolidation of investment products. Intercompany accounts and transactions have been eliminated. The Company evaluates the appropriateness of consolidation of any variable interest entity ("VIEs") in which the Company has a variable interest. A VIE is an entity in which either (a) the equity investment at risk is not sufficient to permit the entity to finance its own activities without additional financial support or (b) where as a group, the holders of the equity investment at risk do not possess: (i) the power through voting or similar rights to direct the activities that most significantly impact the entity’s economic performance; (ii) the obligation to absorb expected losses or the right to receive expected residual returns of the entity; or (iii) proportionate voting and economic interests and where substantially all of the entity’s activities either involve or are conducted on behalf of an investor with disproportionately fewer voting rights. If an entity has any of these characteristics, it is considered a VIE and is required to be consolidated by its primary beneficiary. The primary beneficiary is the entity that has both the power to direct the activities that most significantly impact the VIE’s economic performance and has the obligation to absorb losses of, or the right to receive benefits from, the VIE that could potentially be significant to the VIE. The Company has reclassified certain amounts in prior-period financial statements to conform to the current period's presentation. Previously, the Company reported consolidated investment products and consolidated sponsored investment products separately. Currently, the Company combines these categories under the caption "consolidated investment products" and has accordingly reclassified prior presentations. The reclassifications were not material to the Consolidated Financial Statements. Noncontrolling Interest Noncontrolling interests represent the profit or loss attributed to third-party investors in consolidated investment products and other affiliates. Noncontrolling interests related to certain consolidated investment products are classified as redeemable noncontrolling interests because investors in these funds may request withdrawals at any time. Use of Estimates The preparation of the consolidated financial statements requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosures of contingent assets and liabilities at the dates of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting periods. Management believes the estimates used in preparing the consolidated financial statements are reasonable and prudent. Actual results could differ from those estimates. Segment Information Accounting Standards Codification (“ASC”) 280, Segment Reporting, establishes disclosure requirements relating to operating segments in annual and interim financial statements. Business or operating segments are defined as components of an enterprise about which separate financial information is available that is regularly evaluated by the chief operating decision maker in deciding how to allocate resources and assess performance. The Company operates in one business segment, namely as an asset manager providing investment management and related services for individual and institutional clients. The Company’s Chief Executive Officer is the Company’s chief operating decision maker. Although the Company provides disclosures regarding assets under management and other asset flows by product, the Company’s determination that it operates in one business segment is based on the fact that the same investment professionals manage both retail and institutional products, operational resources support multiple products, such products have the same or similar regulatory framework and the Company’s chief operating decision maker reviews the Company’s financial performance on a consolidated level. Investment managers within the Company are generally not aligned with specific product lines. Cash and Cash Equivalents Cash and cash equivalents consist of cash in banks and money market fund investments. Investments Marketable Securities and collateralized loan obligations Marketable securities are carried at fair value in accordance with ASC 320, Investments—Debt and Equity Securities (“ASC 320”). Marketable securities include sponsored open-end funds and other equity securities classified as trading securities and sponsored closed-end funds classified as available-for-sale securities. The Company also has investments in CLOs for which the Company provides investment management services. These investments in collateralized loan obligations are classified as both trading and available-for-sale. Marketable securities are marked to market based on the respective publicly quoted net asset values of the funds or market prices of the equity securities or bonds. Marketable securities transactions are recorded on a trade date basis. Any unrealized appreciation or depreciation on trading securities is reported as realized and unrealized gain (loss) on investments in the Consolidated Statement of Operations. Any unrealized appreciation or depreciation on available-for-sale securities, net of income taxes, is reported as a component of accumulated other comprehensive income in equity attributable to stockholders in the Consolidated Statement of Comprehensive Income. On a quarterly basis, the Company conducts a review to assess whether other-than-temporary impairments exist on its available-for-sale marketable securities. Other-than-temporary declines in value may exist if the fair value of a marketable security has been below the carrying value for an extended period of time. If an other-than-temporary decline in value is determined to exist, the unrealized investment loss, net of tax, is recognized in the Consolidated Statements of Operations in the period in which the other-than-temporary decline in value occurs, as well as an accompanying permanent adjustment to accumulated other comprehensive income. Equity Method Investments The Company’s investment in noncontrolled entities, where the Company does not hold a controlling financial interest but has the ability to significantly influence operating and financial matters, is accounted for under the equity method of accounting in accordance with ASC 323, Investments-Equity Method and Joint Ventures. Under the equity method of accounting, the Company’s share of the noncontrolled entities net income or loss is recorded in other income (expense), net in the accompanying Consolidated Statements of Operations. Distributions received reduce the Company’s investment. The investment is evaluated for impairment if events or changes indicate that the carrying amount exceeds its fair value. If the carrying amount of an investment does exceed its fair value and the decline in fair value is deemed to be other-than-temporary, an impairment charge will be recorded. Non-qualified Retirement Plan Assets and Liabilities The Company has a non-qualified retirement plan (the “Excess Incentive Plan”) that allows certain employees to voluntarily defer compensation. Assets held in trust, which are considered trading securities, are included in investments and are carried at fair value in accordance with ASC 820, Fair Value Measurement; the associated obligations to participants are included in other liabilities in the Company’s Consolidated Balance Sheets and approximate the fair value of the associated assets. See Note 5 Investments for additional information related to the Excess Incentive Plan. Deferred Commissions Deferred commissions, which are included in other assets in the Company's Consolidated Balance Sheets, are commissions paid to broker-dealers on sales of certain mutual fund share classes. Deferred commissions are recovered by the receipt of monthly asset-based distributor fees from the mutual funds or contingent deferred sales charges received upon redemption of shares within one to five years, depending on the fund share class. The deferred costs resulting from the sale of shares are amortized on a straight-line basis over a one to five-year period, depending on the fund share class, or until the underlying shares are redeemed. Deferred commissions are periodically assessed for impairment and additional amortization expense is recorded, as appropriate. Furniture, Equipment and Leasehold Improvements, Net Furniture, equipment and leasehold improvements are recorded at cost. Depreciation is computed using the straight-line method over the estimated useful lives of three to seven years for furniture and office equipment, and three to five years for computer equipment and software. Leasehold improvements are depreciated over the shorter of the remaining estimated lives of the related leases or useful lives of the improvements. Major renewals or betterments are capitalized, and recurring repairs and maintenance are expensed as incurred. Leases The Company currently leases office space and equipment under various leasing arrangements. Leases are classified as either capital leases or operating leases, as appropriate. Most lease agreements are classified as operating leases and contain renewal options, rent escalation clauses or other inducements provided by the lessor. Rent expense under non-cancelable operating leases with scheduled rent increases or rent holidays is accounted for on a straight-line basis over the lease term, beginning on the date of initial possession or the effective date of the lease agreement. The amount of the excess of straight-line rent expense over scheduled payments is recorded as a deferred liability. Build-out allowances and other such lease incentives are recorded as deferred credits and are amortized on a straight-line basis as a reduction of rent expense beginning in the period they are deemed to be earned, which generally coincides with the effective date of the lease. Goodwill and Intangible Assets Goodwill represents the excess of the purchase price of acquisitions and mergers over the identified net assets and liabilities acquired. In accordance with ASC 350, Goodwill and Other Intangible Assets, goodwill is not amortized. A single reporting unit has been identified for the purpose of assessing potential impairments of goodwill. An impairment analysis of goodwill is performed annually or more frequently, if warranted by events or changes in circumstances affecting the Company’s business. The Company follows the Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) 2011-08, Testing Goodwill for Impairment, which states that an entity has the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing the totality of events or circumstances, an entity determines it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then performing the two-step impairment test is unnecessary. The Company’s 2017 and 2016 annual goodwill impairment analysis did not result in any impairment charges. Definite-lived intangible assets comprise acquired investment advisory contracts. These assets are amortized on a straight-line basis over the estimated useful lives of such assets, which range from one to sixteen years. Definite-lived intangible assets are evaluated for impairment on an ongoing basis whenever events or circumstances indicate that the carrying value of the definite-lived intangible asset may not be fully recoverable. The Company determines if impairment has occurred by comparing estimates of future undiscounted cash flows to the carrying value of assets. Assets are considered impaired, and impairment is recorded, if the carrying value exceeds the expected future undiscounted cash flows. Indefinite-lived intangible assets comprise closed-end and exchange traded fund investment advisory contracts. These assets are tested for impairment annually or when events or changes in circumstances indicate the assets might be impaired. The Company follows ASU No. 2012-02, Testing Indefinite-Lived Intangible Assets for Impairment, which provides entities with an option to perform a qualitative assessment of indefinite-lived intangible assets other than goodwill for impairment to determine if additional impairment testing is necessary. The Company’s 2017 and 2016 annual indefinite-lived intangible assets impairment analysis did not result in any impairment charges. Treasury Stock Treasury stock is accounted for under the cost method and is included as a deduction from equity in the Stockholders’ Equity section of the Consolidated Balance Sheets. Upon any subsequent resale, the treasury stock account is reduced by the cost of such stock. Revenue Recognition Investment management fees, distribution and service fees and administration and shareholder service fees are recorded as revenues during the period in which services are performed. Investment management fees are earned based upon a percentage of assets under management and are paid pursuant to the terms of the respective investment management contracts, which generally require monthly or quarterly payment. The Company accounts for investment management fees in accordance with ASC 605, Revenue Recognition, and has recorded its management fees net of fees paid to unaffiliated subadvisers. The Company considers the nature of its contractual arrangements in determining whether to recognize revenue based on the gross amount billed or net amount retained. The Company has evaluated the factors in ASC 605-45 in determining whether to record revenue on a gross or net basis with significant weight placed on: (i) whether the Company is the primary obligor in the arrangement; and (ii) whether the Company has latitude in establishing price. Amounts paid to unaffiliated subadvisers for the years ended December 31, 2017, 2016 and 2015 were $46.7 million, $47.2 million and $76.4 million, respectively. Distribution and service fees are earned based on a percentage of assets under management and are paid monthly pursuant to the terms of the respective distribution and service fee contracts. Underwriter fees are sales-based charges on sales of certain class A-share mutual funds. Administration and shareholder service fees consist of fund administration fees and shareholder service fees. Fund administration and shareholder service fees are earned based on the average daily assets in the funds. Other income and fees consist primarily of redemption income on the early redemption of certain share classes of mutual funds. Advertising and Promotion Advertising and promotional costs include print advertising and promotional items and are expensed as incurred. These costs are classified in other operating expenses in the Consolidated Statements of Operations. Stock-based Compensation The Company accounts for stock-based compensation expense in accordance with ASC 718, Compensation—Stock Compensation (“ASC 718”), which requires the measurement and recognition of compensation expense for share-based awards based on the estimated fair value on the date of grant. Restricted stock units (“RSUs”) are stock awards that entitle the holder to receive shares of the Company’s common stock as the award vests over time or when certain performance targets are achieved. The fair value of each RSU award is estimated using the intrinsic value method, which is based on the fair market value price on the date of grant unless it contains a performance metric that is considered a market condition. RSUs that contain a market condition are valued using a simulation valuation model. Compensation expense for RSU awards is recognized ratably over the vesting period on a straight-line basis. Income Taxes The Company accounts for income taxes in accordance with ASC 740, Income Taxes, ("ASC 740")which requires recognition of the amount of taxes payable or refundable for the current year, as well as deferred tax liabilities and assets for the future tax consequences of events that have been included in the Company’s financial statements or tax returns. Deferred tax liabilities and assets result from temporary differences between the book value and tax basis of the Company’s assets, liabilities and carry-forwards, such as net operating losses or tax credits. The Company’s methodology for determining the realizability of deferred tax assets includes consideration of taxable income in prior carryback year(s) if carryback is permitted under the tax law, as well as consideration of the reversal of deferred tax liabilities that are in the same period and jurisdiction and are of the same character as the temporary differences that gave rise to the deferred tax assets. The Company’s methodology also includes estimates of future taxable income from its operations, as well as the expiration dates and amounts of carry-forwards related to net operating losses and capital losses. These estimates are projected through the life of the related deferred tax assets based on assumptions that the Company believes to be reasonable and consistent with demonstrated operating results. Changes in future operating results not currently forecasted may have a significant impact on the realization of deferred tax assets. Valuation allowances are provided when it is determined that it is more likely than not that the benefit of deferred tax assets will not be realized. Comprehensive Income The Company reports all changes in comprehensive income in the Consolidated Statements of Changes in Stockholders’ Equity and the Consolidated Statements of Comprehensive Income. Comprehensive income includes net income (loss), foreign currency translation adjustments (net of tax) and unrealized gains and losses on investments classified as available-for-sale (net of tax). Earnings per Share Earnings per share (“EPS”) is calculated in accordance with ASC 260, Earnings per Share. Basic EPS excludes dilution for potential common stock issuances and is computed by dividing basic net income available to common stockholders by the weighted-average number of common shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock, including: (1) shares issuable upon the vesting of RSUs and common stock option exercises using the treasury stock method; and (2) shares issuable upon the conversion of the Company's mandatory convertible preferred stock ("MCPS"), as determined under the if-converted method. For purposes of calculating diluted EPS, preferred stock dividends have been subtracted from net income (loss) in periods in which utilizing the if-converted method would be anti-dilutive. Fair Value Measurements and Fair Value of Financial Instruments ASC 820, Fair Value Measurements and Disclosures, establishes a framework for measuring fair value and a valuation hierarchy based upon the transparency of inputs used in the valuation of an asset or liability. The FASB defines fair value as the price that would be received to sell an asset, or paid to transfer a liability, in an orderly transaction between market participants at the measurement date. Classification within the hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The valuation hierarchy contains three levels as follows: Level 1—Unadjusted quoted prices for identical instruments in active markets. Level 1 assets and liabilities may include debt securities and equity securities that are traded in an active exchange market. Level 2—Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which all significant inputs and significant value drivers are observable in active markets. Level 2 inputs may include observable market data such as closing market prices provided by independent pricing services after considering factors such as the yields or prices of comparable investments of comparable quality, coupon, maturity, call rights and other potential prepayments, terms and type, reported transactions, indications as to values from dealers and general market conditions. In addition, pricing services may determine the fair value of equity securities traded principally in foreign markets when it has been determined that there has been a significant trend in the U.S. equity markets or in index futures trading. Level 2 assets and liabilities may include debt and equity securities, purchased loans and over-the-counter derivative contracts whose fair value is determined using a pricing model without significant unobservable market data inputs. Level 3—Valuations derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable in active exchange markets. Recent Accounting Pronouncements New Accounting Standards Implemented The Company adopted ASU 2016-09, Improvements to Employee Share-Based Payment Accounting ("ASU 2016-09"), on January 1, 2017. This standard makes several modifications to the accounting for forfeitures and employer tax withholdings on share-based compensation as well as the financial statement presentation of excess tax benefits or deficiencies. ASU 2016-09 also clarifies the statement of cash flows presentation of certain components of share-based awards. Upon adoption, the Company recorded a $1.1 million cumulative effect adjustment to retained earnings for excess tax benefits that were not previously recognized because the related tax deduction had not reduced current taxes payable. The Company elected to adopt all provisions impacting the Consolidated Statements of Operations and Cash Flows prospectively. The Company adopted ASU 2016-07, Investments - Equity Method and Joint Ventures (Topic 232): Simplifying the Transition to the Equity Method of Accounting, on January 1, 2017. This standard eliminates the requirement that, when an existing cost method investment qualifies for use of the equity method, a reporting entity must restate its historical financial statements, as if the equity method had been used during all previous periods. Under the new guidance, at the point an investment qualifies for the equity method, any unrealized gain or loss in accumulated other comprehensive income/(loss) would be recognized through earnings. The adoption of this standard did not have a material impact on the Company's consolidated financial statements. New Accounting Standards Not Yet Implemented In January 2017, the FASB issued ASU 2017-01, Clarifying the Definition of a Business ("ASU 2017-01"). ASU 2017-01 provides guidance on evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The standard is effective for interim and annual periods beginning after December 15, 2017. The Company will apply the standard prospectively upon adoption. The impact of this standard on the Company’s consolidated financial statements will depend on acquisitions (or disposals) of assets or businesses by the Company in periods following adoption. In January 2017, the FASB issued ASU 2017-04, Intangibles - Goodwill and Other: Simplifying the Accounting for Goodwill Impairment ("ASU 2017-04"). Under ASU 2017-04, a goodwill impairment will now be the amount by which a reporting unit’s carrying value exceeds its fair value. This standard is effective for annual or any interim goodwill impairment test in fiscal years beginning after December 15, 2019, with early adoption permitted for impairment tests performed after January 1, 2017. The Company adopted this standard effective January 1, 2018, and will apply the standard prospectively for all future annual and interim goodwill impairment tests. The impact of the new standard will depend on the outcomes of future goodwill impairment tests. In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash (“ASU 2016-18”). ASU 2016-18 requires the inclusion of restricted cash with cash and cash equivalents when reconciling the beginning and ending cash on the statement of cash flows. This standard is effective for annual periods beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. A reporting entity is required to apply this standard on a retrospective basis as of the beginning of the fiscal year for which the standard is effective. The Company adopted this standard effective January 1, 2018. The adoption of this standard did not have a material impact on the Company's consolidated financial statements. In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments ("ASU 2016-15"), which clarifies the treatment of several cash flow activities. ASU 2016-15 also clarifies that when cash receipts and cash payments have aspects of more than one classification of cash flows and cannot be separated, classification will depend on the predominant source or use. This update is effective for annual periods beginning after December 15, 2017 and interim periods within those fiscal years. The Company adopted this standard effective January 1, 2018. The adoption of this standard did not have a material impact on the Company's consolidated financial statements. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers ("ASU 2014-09"), which outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. ASU 2014-09 was originally effective for fiscal years, and interim periods within those years, beginning after December 15, 2016. In August 2015, the FASB issued ASU 2015-14, which deferred the effective date of ASU 2014-09 by one year or for periods beginning after December 15, 2017. Adoption of the standard requires either a retrospective or a modified retrospective approach to adoption, and early adoption is permitted as of the original effective date. The core principle of the model is that revenue is recognized upon the transfer of promised goods or services to customers in an amount that reflects the expected consideration to be received for the goods or services. In March 2016, the FASB issued ASU 2016-08, Principal Versus Agent Considerations (Reporting Revenue Gross Versus Net), which amends the principal-versus-agent implementation guidance in ASU 2014-09, Revenue from Contracts with Customers, discussed above. The new guidance will impact whether an entity reports revenue on a gross or net basis. These updates are effective for annual periods beginning after December 15, 2017 and interim periods within those fiscal years. The Company's implementation assessment included the identification of revenue within the scope of the guidance, as well as the review of terms and conditions of a sample of revenue contracts covering a broad range of products. The Company adopted ASU 2014-09 effective January 1, 2018, using the modified retrospective approach and has determined that the adoption did not have a material change in the timing of recognition of the Company's revenue. Due to the revised criteria related to whether or not the Company is acting as a principal or agent the Company expects certain costs that are currently presented on a net of revenue basis to be presented on a gross revenue basis under the revised criteria. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) ("ASU 2016-02"). The standard replaces current codification Topic 840 with updated guidance on accounting for leases and requires a lessee to recognize assets and liabilities arising from an operating lease on the balance sheet, whereas previous guidance did not require lease assets and liabilities to be recognized for most leases. Furthermore, this standard permits companies to make an accounting policy election to not recognize lease assets and liabilities for leases with a term of 12 months or less. For both finance leases and operating leases, the lease liability should be initially measured at the present value of the lease payments. The recognition, measurement and presentation of expenses and cash flows arising from a lease by a lessee will not significantly change under this new guidance. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018 and interim periods therein. Early adoption is permitted. The Company is currently evaluating the potential impact of this standard on its consolidated financial statements but expects to record a right-of-use asset and a related lease obligation in the Company's consolidated balance sheet upon adoption. In January 2016, the FASB issued ASU No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities ("ASU 2016-01"), which requires all equity investments (other than those accounted for under the equity method) to be measured at fair value with changes in the fair value recognized through net income. ASU 2016-01 is effective for fiscal years beginning after December 15, 2017 and interim periods therein. Early adoption is not permitted. The Company has evaluated the impact of this standard on its consolidated financial statements with respect to equity investments that currently report changes in fair value as a component of accumulated other comprehensive income in equity attributable to stockholders. Comprehensive income (loss), net of tax, with respect to these equity investments was $(0.4) million and $0.2 million for the years ended December 31, 2017 and December 31, 2016, respectively. The Company adopted this standard effective January 1, 2018. The adoption of this standard did not have a material impact on the Company's consolidated financial statements.

Summary of Significant Accounting Policies

The Company’s significant accounting policies, which have been consistently applied, are as follows:

Principles of Consolidation and Basis of Presentation

The Company’s consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”). The consolidated financial statements include the accounts of the Company, its subsidiaries and investment products that are consolidated. Voting interest entities ("VOEs") are consolidated when the Company is considered to have a controlling financial interest, which is typically present when the Company owns a majority of the voting interest in an entity or otherwise has the power to govern the financial and operating policies of the entity. See Note 18 for additional information related to the consolidation of investment products. Intercompany accounts and transactions have been eliminated.

The Company evaluates the appropriateness of consolidation of any variable interest entity ("VIEs") in which the Company has a variable interest. A VIE is an entity in which either (a) the equity investment at risk is not sufficient to permit the entity to finance its own activities without additional financial support or (b) where as a group, the holders of the equity investment at risk do not possess: (i) the power through voting or similar rights to direct the activities that most significantly impact the entity’s economic performance; (ii) the obligation to absorb expected losses or the right to receive expected residual returns of the entity; or (iii) proportionate voting and economic interests and where substantially all of the entity’s activities either involve or are conducted on behalf of an investor with disproportionately fewer voting rights. If an entity has any of these characteristics, it is considered a VIE and is required to be consolidated by its primary beneficiary. The primary beneficiary is the entity that has both the power to direct the activities that most significantly impact the VIE’s economic performance and has the obligation to absorb losses of, or the right to receive benefits from, the VIE that could potentially be significant to the VIE.

The Company has reclassified certain amounts in prior-period financial statements to conform to the current period's presentation. Previously, the Company reported consolidated investment products and consolidated sponsored investment products separately. Currently, the Company combines these categories under the caption "consolidated investment products" and has accordingly reclassified prior presentations. The reclassifications were not material to the Consolidated Financial Statements.

Noncontrolling Interest

Noncontrolling interests represent the profit or loss attributed to third-party investors in consolidated investment products and other affiliates. Noncontrolling interests related to certain consolidated investment products are classified as redeemable noncontrolling interests because investors in these funds may request withdrawals at any time.

Use of Estimates

The preparation of the consolidated financial statements requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosures of contingent assets and liabilities at the dates of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting periods. Management believes the estimates used in preparing the consolidated financial statements are reasonable and prudent. Actual results could differ from those estimates.

Segment Information

Accounting Standards Codification (“ASC”) 280, Segment Reporting, establishes disclosure requirements relating to operating segments in annual and interim financial statements. Business or operating segments are defined as components of an enterprise about which separate financial information is available that is regularly evaluated by the chief operating decision maker in deciding how to allocate resources and assess performance. The Company operates in one business segment, namely as an asset manager providing investment management and related services for individual and institutional clients. The Company’s Chief Executive Officer is the Company’s chief operating decision maker. Although the Company provides disclosures regarding assets under management and other asset flows by product, the Company’s determination that it operates in one business segment is based on the fact that the same investment professionals manage both retail and institutional products, operational resources support multiple products, such products have the same or similar regulatory framework and the Company’s chief operating decision maker reviews the Company’s financial performance on a consolidated level. Investment managers within the Company are generally not aligned with specific product lines.

Cash and Cash Equivalents

Cash and cash equivalents consist of cash in banks and money market fund investments.

Investments

Marketable Securities and collateralized loan obligations

Marketable securities are carried at fair value in accordance with ASC 320, Investments—Debt and Equity Securities (“ASC 320”). Marketable securities include sponsored open-end funds and other equity securities classified as trading securities and sponsored closed-end funds classified as available-for-sale securities. The Company also has investments in CLOs for which the Company provides investment management services. These investments in collateralized loan obligations are classified as both trading and available-for-sale. Marketable securities are marked to market based on the respective publicly quoted net asset values of the funds or market prices of the equity securities or bonds. Marketable securities transactions are recorded on a trade date basis. Any unrealized appreciation or depreciation on trading securities is reported as realized and unrealized gain (loss) on investments in the Consolidated Statement of Operations. Any unrealized appreciation or depreciation on available-for-sale securities, net of income taxes, is reported as a component of accumulated other comprehensive income in equity attributable to stockholders in the Consolidated Statement of Comprehensive Income.

On a quarterly basis, the Company conducts a review to assess whether other-than-temporary impairments exist on its available-for-sale marketable securities. Other-than-temporary declines in value may exist if the fair value of a marketable security has been below the carrying value for an extended period of time. If an other-than-temporary decline in value is determined to exist, the unrealized investment loss, net of tax, is recognized in the Consolidated Statements of Operations in the period in which the other-than-temporary decline in value occurs, as well as an accompanying permanent adjustment to accumulated other comprehensive income.

Equity Method Investments

The Company’s investment in noncontrolled entities, where the Company does not hold a controlling financial interest but has the ability to significantly influence operating and financial matters, is accounted for under the equity method of accounting in accordance with ASC 323, Investments-Equity Method and Joint Ventures. Under the equity method of accounting, the Company’s share of the noncontrolled entities net income or loss is recorded in other income (expense), net in the accompanying Consolidated Statements of Operations. Distributions received reduce the Company’s investment. The investment is evaluated for impairment if events or changes indicate that the carrying amount exceeds its fair value. If the carrying amount of an investment does exceed its fair value and the decline in fair value is deemed to be other-than-temporary, an impairment charge will be recorded.

Non-qualified Retirement Plan Assets and Liabilities

The Company has a non-qualified retirement plan (the “Excess Incentive Plan”) that allows certain employees to voluntarily defer compensation. Assets held in trust, which are considered trading securities, are included in investments and are carried at fair value in accordance with ASC 820, Fair Value Measurement; the associated obligations to participants are included in other liabilities in the Company’s Consolidated Balance Sheets and approximate the fair value of the associated assets. See Note 5 Investments for additional information related to the Excess Incentive Plan.

Deferred Commissions

Deferred commissions, which are included in other assets in the Company's Consolidated Balance Sheets, are commissions paid to broker-dealers on sales of certain mutual fund share classes. Deferred commissions are recovered by the receipt of monthly asset-based distributor fees from the mutual funds or contingent deferred sales charges received upon redemption of shares within one to five years, depending on the fund share class. The deferred costs resulting from the sale of shares are amortized on a straight-line basis over a one to five-year period, depending on the fund share class, or until the underlying shares are redeemed. Deferred commissions are periodically assessed for impairment and additional amortization expense is recorded, as appropriate.

Furniture, Equipment and Leasehold Improvements, Net

Furniture, equipment and leasehold improvements are recorded at cost. Depreciation is computed using the straight-line method over the estimated useful lives of three to seven years for furniture and office equipment, and three to five years for computer equipment and software. Leasehold improvements are depreciated over the shorter of the remaining estimated lives of the related leases or useful lives of the improvements. Major renewals or betterments are capitalized, and recurring repairs and maintenance are expensed as incurred.

Leases

The Company currently leases office space and equipment under various leasing arrangements. Leases are classified as either capital leases or operating leases, as appropriate. Most lease agreements are classified as operating leases and contain renewal options, rent escalation clauses or other inducements provided by the lessor. Rent expense under non-cancelable operating leases with scheduled rent increases or rent holidays is accounted for on a straight-line basis over the lease term, beginning on the date of initial possession or the effective date of the lease agreement. The amount of the excess of straight-line rent expense over scheduled payments is recorded as a deferred liability. Build-out allowances and other such lease incentives are recorded as deferred credits and are amortized on a straight-line basis as a reduction of rent expense beginning in the period they are deemed to be earned, which generally coincides with the effective date of the lease.

Goodwill and Intangible Assets

Goodwill represents the excess of the purchase price of acquisitions and mergers over the identified net assets and liabilities acquired. In accordance with ASC 350, Goodwill and Other Intangible Assets, goodwill is not amortized. A single reporting unit has been identified for the purpose of assessing potential impairments of goodwill. An impairment analysis of goodwill is performed annually or more frequently, if warranted by events or changes in circumstances affecting the Company’s business. The Company follows the Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) 2011-08, Testing Goodwill for Impairment, which states that an entity has the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing the totality of events or circumstances, an entity determines it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then performing the two-step impairment test is unnecessary. The Company’s 2017 and 2016 annual goodwill impairment analysis did not result in any impairment charges.

Definite-lived intangible assets comprise acquired investment advisory contracts. These assets are amortized on a straight-line basis over the estimated useful lives of such assets, which range from one to sixteen years. Definite-lived intangible assets are evaluated for impairment on an ongoing basis whenever events or circumstances indicate that the carrying value of the definite-lived intangible asset may not be fully recoverable. The Company determines if impairment has occurred by comparing estimates of future undiscounted cash flows to the carrying value of assets. Assets are considered impaired, and impairment is recorded, if the carrying value exceeds the expected future undiscounted cash flows.

Indefinite-lived intangible assets comprise closed-end and exchange traded fund investment advisory contracts. These assets are tested for impairment annually or when events or changes in circumstances indicate the assets might be impaired. The Company follows ASU No. 2012-02, Testing Indefinite-Lived Intangible Assets for Impairment, which provides entities with an option to perform a qualitative assessment of indefinite-lived intangible assets other than goodwill for impairment to determine if additional impairment testing is necessary. The Company’s 2017 and 2016 annual indefinite-lived intangible assets impairment analysis did not result in any impairment charges.

Treasury Stock

Treasury stock is accounted for under the cost method and is included as a deduction from equity in the Stockholders’ Equity section of the Consolidated Balance Sheets. Upon any subsequent resale, the treasury stock account is reduced by the cost of such stock.

Revenue Recognition

Investment management fees, distribution and service fees and administration and shareholder service fees are recorded as revenues during the period in which services are performed. Investment management fees are earned based upon a percentage of assets under management and are paid pursuant to the terms of the respective investment management contracts, which generally require monthly or quarterly payment.

The Company accounts for investment management fees in accordance with ASC 605, Revenue Recognition, and has recorded its management fees net of fees paid to unaffiliated subadvisers. The Company considers the nature of its contractual arrangements in determining whether to recognize revenue based on the gross amount billed or net amount retained. The Company has evaluated the factors in ASC 605-45 in determining whether to record revenue on a gross or net basis with significant weight placed on: (i) whether the Company is the primary obligor in the arrangement; and (ii) whether the Company has latitude in establishing price. Amounts paid to unaffiliated subadvisers for the years ended December 31, 2017, 2016 and 2015 were $46.7 million, $47.2 million and $76.4 million, respectively.

Distribution and service fees are earned based on a percentage of assets under management and are paid monthly pursuant to the terms of the respective distribution and service fee contracts. Underwriter fees are sales-based charges on sales of certain class A-share mutual funds.

Administration and shareholder service fees consist of fund administration fees and shareholder service fees. Fund administration and shareholder service fees are earned based on the average daily assets in the funds.

Other income and fees consist primarily of redemption income on the early redemption of certain share classes of mutual funds.

Advertising and Promotion

Advertising and promotional costs include print advertising and promotional items and are expensed as incurred. These costs are classified in other operating expenses in the Consolidated Statements of Operations.

Stock-based Compensation

The Company accounts for stock-based compensation expense in accordance with ASC 718, Compensation—Stock Compensation (“ASC 718”), which requires the measurement and recognition of compensation expense for share-based awards based on the estimated fair value on the date of grant.

Restricted stock units (“RSUs”) are stock awards that entitle the holder to receive shares of the Company’s common stock as the award vests over time or when certain performance targets are achieved. The fair value of each RSU award is estimated using the intrinsic value method, which is based on the fair market value price on the date of grant unless it contains a performance metric that is considered a market condition. RSUs that contain a market condition are valued using a simulation valuation model. Compensation expense for RSU awards is recognized ratably over the vesting period on a straight-line basis.

Income Taxes

The Company accounts for income taxes in accordance with ASC 740, Income Taxes, ("ASC 740")which requires recognition of the amount of taxes payable or refundable for the current year, as well as deferred tax liabilities and assets for the future tax consequences of events that have been included in the Company’s financial statements or tax returns. Deferred tax liabilities and assets result from temporary differences between the book value and tax basis of the Company’s assets, liabilities and carry-forwards, such as net operating losses or tax credits.

The Company’s methodology for determining the realizability of deferred tax assets includes consideration of taxable income in prior carryback year(s) if carryback is permitted under the tax law, as well as consideration of the reversal of deferred tax liabilities that are in the same period and jurisdiction and are of the same character as the temporary differences that gave rise to the deferred tax assets. The Company’s methodology also includes estimates of future taxable income from its operations, as well as the expiration dates and amounts of carry-forwards related to net operating losses and capital losses. These estimates are projected through the life of the related deferred tax assets based on assumptions that the Company believes to be reasonable and consistent with demonstrated operating results. Changes in future operating results not currently forecasted may have a significant impact on the realization of deferred tax assets. Valuation allowances are provided when it is determined that it is more likely than not that the benefit of deferred tax assets will not be realized.

Comprehensive Income

The Company reports all changes in comprehensive income in the Consolidated Statements of Changes in Stockholders’ Equity and the Consolidated Statements of Comprehensive Income. Comprehensive income includes net income (loss), foreign currency translation adjustments (net of tax) and unrealized gains and losses on investments classified as available-for-sale (net of tax).

Earnings per Share

Earnings per share (“EPS”) is calculated in accordance with ASC 260, Earnings per Share. Basic EPS excludes dilution for potential common stock issuances and is computed by dividing basic net income available to common stockholders by the weighted-average number of common shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock, including: (1) shares issuable upon the vesting of RSUs and common stock option exercises using the treasury stock method; and (2) shares issuable upon the conversion of the Company's mandatory convertible preferred stock ("MCPS"), as determined under the if-converted method. For purposes of calculating diluted EPS, preferred stock dividends have been subtracted from net income (loss) in periods in which utilizing the if-converted method would be anti-dilutive.

Fair Value Measurements and Fair Value of Financial Instruments

ASC 820, Fair Value Measurements and Disclosures, establishes a framework for measuring fair value and a valuation hierarchy based upon the transparency of inputs used in the valuation of an asset or liability. The FASB defines fair value as the price that would be received to sell an asset, or paid to transfer a liability, in an orderly transaction between market participants at the measurement date. Classification within the hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The valuation hierarchy contains three levels as follows:

Level 1—Unadjusted quoted prices for identical instruments in active markets. Level 1 assets and liabilities may include debt securities and equity securities that are traded in an active exchange market.

Level 2—Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which all significant inputs and significant value drivers are observable in active markets. Level 2 inputs may include observable market data such as closing market prices provided by independent pricing services after considering factors such as the yields or prices of comparable investments of comparable quality, coupon, maturity, call rights and other potential prepayments, terms and type, reported transactions, indications as to values from dealers and general market conditions. In addition, pricing services may determine the fair value of equity securities traded principally in foreign markets when it has been determined that there has been a significant trend in the U.S. equity markets or in index futures trading. Level 2 assets and liabilities may include debt and equity securities, purchased loans and over-the-counter derivative contracts whose fair value is determined using a pricing model without significant unobservable market data inputs.

Level 3—Valuations derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable in active exchange markets.

Recent Accounting Pronouncements

New Accounting Standards Implemented

The Company adopted ASU 2016-09, Improvements to Employee Share-Based Payment Accounting ("ASU 2016-09"), on January 1, 2017. This standard makes several modifications to the accounting for forfeitures and employer tax withholdings on share-based compensation as well as the financial statement presentation of excess tax benefits or deficiencies. ASU 2016-09 also clarifies the statement of cash flows presentation of certain components of share-based awards. Upon adoption, the Company recorded a $1.1 million cumulative effect adjustment to retained earnings for excess tax benefits that were not previously recognized because the related tax deduction had not reduced current taxes payable. The Company elected to adopt all provisions impacting the Consolidated Statements of Operations and Cash Flows prospectively.

The Company adopted ASU 2016-07, Investments - Equity Method and Joint Ventures (Topic 232): Simplifying the Transition to the Equity Method of Accounting, on January 1, 2017. This standard eliminates the requirement that, when an existing cost method investment qualifies for use of the equity method, a reporting entity must restate its historical financial statements, as if the equity method had been used during all previous periods. Under the new guidance, at the point an investment qualifies for the equity method, any unrealized gain or loss in accumulated other comprehensive income/(loss) would be recognized through earnings. The adoption of this standard did not have a material impact on the Company's consolidated financial statements.

New Accounting Standards Not Yet Implemented

In January 2017, the FASB issued ASU 2017-01, Clarifying the Definition of a Business ("ASU 2017-01"). ASU 2017-01 provides guidance on evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The standard is effective for interim and annual periods beginning after December 15, 2017. The Company will apply the standard prospectively upon adoption. The impact of this standard on the Company’s consolidated financial statements will depend on acquisitions (or disposals) of assets or businesses by the Company in periods following adoption.

In January 2017, the FASB issued ASU 2017-04, Intangibles - Goodwill and Other: Simplifying the Accounting for Goodwill Impairment ("ASU 2017-04"). Under ASU 2017-04, a goodwill impairment will now be the amount by which a reporting unit’s carrying value exceeds its fair value. This standard is effective for annual or any interim goodwill impairment test in fiscal years beginning after December 15, 2019, with early adoption permitted for impairment tests performed after January 1, 2017. The Company adopted this standard effective January 1, 2018, and will apply the standard prospectively for all future annual and interim goodwill impairment tests. The impact of the new standard will depend on the outcomes of future goodwill impairment tests.

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash (“ASU 2016-18”). ASU 2016-18 requires the inclusion of restricted cash with cash and cash equivalents when reconciling the beginning and ending cash on the statement of cash flows. This standard is effective for annual periods beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. A reporting entity is required to apply this standard on a retrospective basis as of the beginning of the fiscal year for which the standard is effective. The Company adopted this standard effective January 1, 2018. The adoption of this standard did not have a material impact on the Company's consolidated financial statements.

In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments ("ASU 2016-15"), which clarifies the treatment of several cash flow activities. ASU 2016-15 also clarifies that when cash receipts and cash payments have aspects of more than one classification of cash flows and cannot be separated, classification will depend on the predominant source or use. This update is effective for annual periods beginning after December 15, 2017 and interim periods within those fiscal years. The Company adopted this standard effective January 1, 2018. The adoption of this standard did not have a material impact on the Company's consolidated financial statements.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers ("ASU 2014-09"), which outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. ASU 2014-09 was originally effective for fiscal years, and interim periods within those years, beginning after December 15, 2016. In August 2015, the FASB issued ASU 2015-14, which deferred the effective date of ASU 2014-09 by one year or for periods beginning after December 15, 2017. Adoption of the standard requires either a retrospective or a modified retrospective approach to adoption, and early adoption is permitted as of the original effective date. The core principle of the model is that revenue is recognized upon the transfer of promised goods or services to customers in an amount that reflects the expected consideration to be received for the goods or services. In March 2016, the FASB issued ASU 2016-08, Principal Versus Agent Considerations (Reporting Revenue Gross Versus Net), which amends the principal-versus-agent implementation guidance in ASU 2014-09, Revenue from Contracts with Customers, discussed above. The new guidance will impact whether an entity reports revenue on a gross or net basis. These updates are effective for annual periods beginning after December 15, 2017 and interim periods within those fiscal years. The Company's implementation assessment included the identification of revenue within the scope of the guidance, as well as the review of terms and conditions of a sample of revenue contracts covering a broad range of products. The Company adopted ASU 2014-09 effective January 1, 2018, using the modified retrospective approach and has determined that the adoption did not have a material change in the timing of recognition of the Company's revenue. Due to the revised criteria related to whether or not the Company is acting as a principal or agent the Company expects certain costs that are currently presented on a net of revenue basis to be presented on a gross revenue basis under the revised criteria.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) ("ASU 2016-02"). The standard replaces current codification Topic 840 with updated guidance on accounting for leases and requires a lessee to recognize assets and liabilities arising from an operating lease on the balance sheet, whereas previous guidance did not require lease assets and liabilities to be recognized for most leases. Furthermore, this standard permits companies to make an accounting policy election to not recognize lease assets and liabilities for leases with a term of 12 months or less. For both finance leases and operating leases, the lease liability should be initially measured at the present value of the lease payments. The recognition, measurement and presentation of expenses and cash flows arising from a lease by a lessee will not significantly change under this new guidance. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018 and interim periods therein. Early adoption is permitted. The Company is currently evaluating the potential impact of this standard on its consolidated financial statements but expects to record a right-of-use asset and a related lease obligation in the Company's consolidated balance sheet upon adoption.

In January 2016, the FASB issued ASU No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities ("ASU 2016-01"), which requires all equity investments (other than those accounted for under the equity method) to be measured at fair value with changes in the fair value recognized through net income. ASU 2016-01 is effective for fiscal years beginning after December 15, 2017 and interim periods therein. Early adoption is not permitted. The Company has evaluated the impact of this standard on its consolidated financial statements with respect to equity investments that currently report changes in fair value as a component of accumulated other comprehensive income in equity attributable to stockholders. Comprehensive income (loss), net of tax, with respect to these equity investments was $(0.4) million and $0.2 million for the years ended December 31, 2017 and December 31, 2016, respectively. The Company adopted this standard effective January 1, 2018. The adoption of this standard did not have a material impact on the Company's consolidated financial statements.