Loan Facilities	9 Months Ended
Sep. 30, 2018
Debt Disclosure [Abstract]
Loan Facilities	Loan Facilities In October 2017, as part of a recapitalization plan, the Company entered into a new credit agreement with a syndicate of lenders, who lent a principal amount of $350.0 million under a five-year secured term loan facility ("Term Loan Facility") and provided a three-year secured revolving credit facility ("Revolving Loan Facility") for $20.0 million, which was undrawn at closing. The Term Loan Facility and the Revolving Loan Facility together are referred to as the "Secured Loan Facilities". In conjunction with the borrowings under the Secured Loan Facilities, the Company incurred expenses of $11.5 million, consisting of original issue discount of $1.75 million and deferred financing costs of $9.8 million, which were recorded as a reduction in the initial carrying value of the Term Loan Facility. These costs are being amortized into interest expense over the lives of the obligations. In conjunction with the borrowing of the Term Loan Facility, the Company used a portion of the proceeds to repay in full outstanding borrowings under the previously existing revolving bank loan facility. As of September 30, 2018 and December 31, 2017, the Term Loan Facility carrying values were $327.7 million and $339.0 million, respectively, and no amounts were outstanding under the Revolving Loan Facility at either date. The carrying value of the Term Loan Facility, excluding the unamortized debt issuance costs that are presented as a reduction to the debt principal balance, approximated the fair value. As the borrowings are not accounted for at fair value, their fair value is not included in the Company's fair value hierarchy in "Note 4 — Fair Value of Financial Instruments," however, had these borrowings been included, they would have been classified in Level 2. For the three and nine months ended September 30, 2018, the Company incurred interest expense of $5.7 million and $16.6 million, respectively, of which $0.6 million and $1.7 million related to the amortization of the debt issuance costs. For the three and nine months ended September 30, 2017, the Company incurred interest expense of $0.9 million and $2.5 million, respectively, related to bank loan borrowings, which were repaid as part of the October 2017 recapitalization. Borrowings under the Secured Loan Facilities bear interest at either the U.S. Prime Rate plus 2.75% or LIBOR plus 3.75%. Borrowings under the Secured Loan Facilities had a weighted average interest rate for the nine months ended September 30, 2018 of 5.65%. The Term Loan Facility requires quarterly principal amortization payments of $4.375 million, which began on March 31, 2018 and continued through September 30, 2018, and $8.75 million (or $35.0 million annually) beginning December 31, 2018 through September 30, 2022, with the remaining balance of the Term Loan Facility due at maturity on October 12, 2022. In addition, beginning for the year ended December 31, 2018, the Company is required to make annual repayments of principal on the Term Loan Facility within ninety days of year end of up to 50% (determined based on the net leverage ratio) of its annual excess cash flow as defined in the credit agreement. The Company is also required to repay certain amounts of the Term Loan Facility in connection with the non-ordinary course sale of assets, receipt of insurance proceeds, and the issuance of debt obligations, subject to certain exceptions. During the nine months ended September 30, 2018, the Company made mandatory principal payments of $13.125 million. All mandatory repayments of the Term Loan Facility will be applied without penalty or premium. Voluntary prepayments of borrowings under the Term Loan Facility will be permitted. In the event that all or any portion of the Term Loan Facility is prepaid or refinanced or repriced through any amendment prior to April 12, 2019, such prepayment, refinancing, or repricing will be at 101.0% of the principal amount so prepaid, refinanced or repriced. The Term Loan Facility and Revolving Loan Facility are both guaranteed by the Company's existing and subsequently acquired or organized wholly-owned U.S. restricted subsidiaries (excluding any registered broker-dealers) and secured with a first priority perfected security interest in certain domestic assets and 100% of the capital stock of each U.S. subsidiary and 65% of the capital stock of each non-U.S. subsidiary, subject to certain exclusions which, for the avoidance of doubt, such security interest shall not include any assets of regulated subsidiaries that are not permitted to be pledged by law, statute or regulation, including cash held by regulated subsidiaries and any other capital required to meet and maintain regulatory capital requirements. The credit facilities contain certain covenants that limit the Company's ability above certain permitted amounts to incur additional indebtedness, make certain acquisitions, pay dividends and repurchase shares. The Term Loan Facility does not have financial covenants and the Revolving Loan Facility is subject to a springing total net leverage ratio financial covenant, subject to certain step downs, if the Company's borrowings under the revolving loan facility exceed $12.5 million. The Company is also subject to certain other non-financial covenants. At September 30, 2018, the Company was compliant with all loan covenants.

Loan Facilities

In October 2017, as part of a recapitalization plan, the Company entered into a new credit agreement with a syndicate of lenders, who lent a principal amount of $350.0 million under a five-year secured term loan facility ("Term Loan Facility") and provided a three-year secured revolving credit facility ("Revolving Loan Facility") for $20.0 million, which was undrawn at closing. The Term Loan Facility and the Revolving Loan Facility together are referred to as the "Secured Loan Facilities". In conjunction with the borrowings under the Secured Loan Facilities, the Company incurred expenses of $11.5 million, consisting of original issue discount of $1.75 million and deferred financing costs of $9.8 million, which were recorded as a reduction in the initial carrying value of the Term Loan Facility. These costs are being amortized into interest expense over the lives of the obligations. In conjunction with the borrowing of the Term Loan Facility, the Company used a portion of the proceeds to repay in full outstanding borrowings under the previously existing revolving bank loan facility.

As of September 30, 2018 and December 31, 2017, the Term Loan Facility carrying values were $327.7 million and $339.0 million, respectively, and no amounts were outstanding under the Revolving Loan Facility at either date. The carrying value of the Term Loan Facility, excluding the unamortized debt issuance costs that are presented as a reduction to the debt principal balance, approximated the fair value. As the borrowings are not accounted for at fair value, their fair value is not included in the Company's fair value hierarchy in "Note 4 — Fair Value of Financial Instruments," however, had these borrowings been included, they would have been classified in Level 2. For the three and nine months ended September 30, 2018, the Company incurred interest expense of $5.7 million and $16.6 million, respectively, of which $0.6 million and $1.7 million related to the amortization of the debt issuance costs. For the three and nine months ended September 30, 2017, the Company incurred interest expense of $0.9 million and $2.5 million, respectively, related to bank loan borrowings, which were repaid as part of the October 2017 recapitalization.

Borrowings under the Secured Loan Facilities bear interest at either the U.S. Prime Rate plus 2.75% or LIBOR plus 3.75%. Borrowings under the Secured Loan Facilities had a weighted average interest rate for the nine months ended September 30, 2018 of 5.65%. The Term Loan Facility requires quarterly principal amortization payments of $4.375 million, which began on March 31, 2018 and continued through September 30, 2018, and $8.75 million (or $35.0 million annually) beginning December 31, 2018 through September 30, 2022, with the remaining balance of the Term Loan Facility due at maturity on October 12, 2022. In addition, beginning for the year ended December 31, 2018, the Company is required to make annual repayments of principal on the Term Loan Facility within ninety days of year end of up to 50% (determined based on the net leverage ratio) of its annual excess cash flow as defined in the credit agreement. The Company is also required to repay certain amounts of the Term Loan Facility in connection with the non-ordinary course sale of assets, receipt of insurance proceeds, and the issuance of debt obligations, subject to certain exceptions.

During the nine months ended September 30, 2018, the Company made mandatory principal payments of $13.125 million. All mandatory repayments of the Term Loan Facility will be applied without penalty or premium. Voluntary prepayments of borrowings under the Term Loan Facility will be permitted. In the event that all or any portion of the Term Loan Facility is prepaid or refinanced or repriced through any amendment prior to April 12, 2019, such prepayment, refinancing, or repricing will be at 101.0% of the principal amount so prepaid, refinanced or repriced.

The Term Loan Facility and Revolving Loan Facility are both guaranteed by the Company's existing and subsequently acquired or organized wholly-owned U.S. restricted subsidiaries (excluding any registered broker-dealers) and secured with a first priority perfected security interest in certain domestic assets and 100% of the capital stock of each U.S. subsidiary and 65% of the capital stock of each non-U.S. subsidiary, subject to certain exclusions which, for the avoidance of doubt, such security interest shall not include any assets of regulated subsidiaries that are not permitted to be pledged by law, statute or regulation, including cash held by regulated subsidiaries and any other capital required to meet and maintain regulatory capital requirements. The credit facilities contain certain covenants that limit the Company's ability above certain permitted amounts to incur additional indebtedness, make certain acquisitions, pay dividends and repurchase shares. The Term Loan Facility does not have financial covenants and the Revolving Loan Facility is subject to a springing total net leverage ratio financial covenant, subject to certain step downs, if the Company's borrowings under the revolving loan facility exceed $12.5 million. The Company is also subject to certain other non-financial covenants. At September 30, 2018, the Company was compliant with all loan covenants.