Recent Accounting Standards (Policy)	3 Months Ended
Mar. 31, 2019
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Pronouncements	On January 1, 2019, we adopted Accounting Standards Update (ASU) 2016-02, Leases (Topic 842), which requires the recognition of lease rights and obligations as assets and liabilities on the balance sheet. Previously, lessees were not required to recognize on the balance sheet assets and liabilities arising from operating leases. We adopted Topic 842 using the modified retrospective method of adoption applying the transition provisions at the beginning of the period of adoption, rather than at the beginning of the earliest comparative period presented in these financial statements. As a result, prior period information has not been restated. The new standard provides several optional practical expedients for use in transition. We elected to use what the FASB has deemed the “package of practical expedients,” which allows us not to reassess our previous conclusions about lease identification, lease classification and the accounting treatment for initial direct costs. The ASU also provides several optional practical expedients for the ongoing accounting for leases. We have elected the short-term lease recognition exemption for all leases that qualify, meaning that for leases with terms of twelve months or less, we will not recognize right-of-use (ROU) assets or lease liabilities on our consolidated balance sheet. Additionally, we have elected to use the practical expedient to not separate lease and non-lease components for leases of real estate, meaning that for these leases, the non-lease components are included in the associated ROU asset and lease liability balances on our consolidated balance sheet. The most significant impacts of adopting Topic 842 on our consolidated financial statements were (1) the recognition of new ROU assets and lease liabilities for our operating leases of $31.1 million and $34.9 million, respectively on January 1, 2019, which included reclassifying accrued rent as a component of the ROU asset, and (2) significant new disclosures about our leasing activities, which are provided in Note 13. Topic 842 did not have a material impact on our results of operations or cash flows. In January 2017, the FASB issued ASU No. 2017-04, Simplifying the Test for Goodwill Impairment. The standard will remove step 2 from the goodwill impairment test. Under the ASU, an entity should perform its annual goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount and recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value, however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. ASU 2017-04 is effective for public companies for annual reporting periods beginning after December 15, 2019. Early adoption is permitted for goodwill impairment tests performed on testing dates after January 1, 2017. We adopted the standard on January 1, 2019. The adoption of the ASU did not have an effect on our results of operations, financial condition or cash flows. Accounting Standards Not Yet Adopted For a discussion of other accounting standards that have been issued by the FASB but are not yet effective, refer to the Recent Accounting Standards section in our Annual Report on Form 10-K for the year ended December 31, 2018. These standards are not expected to have a material impact on our results of operations, financial condition or cash flows.

On January 1, 2019, we adopted Accounting Standards Update (ASU) 2016-02, Leases (Topic 842), which requires the recognition of lease rights and obligations as assets and liabilities on the balance sheet. Previously, lessees were not required to recognize on the balance sheet assets and liabilities arising from operating leases. We adopted Topic 842 using the modified retrospective method of adoption applying the transition provisions at the beginning of the period of adoption, rather than at the beginning of the earliest comparative period presented in these financial statements. As a result, prior period information has not been restated.

The new standard provides several optional practical expedients for use in transition. We elected to use what the FASB has deemed the “package of practical expedients,” which allows us not to reassess our previous conclusions about lease identification, lease classification and the accounting treatment for initial direct costs. The ASU also provides several optional practical expedients for the ongoing accounting for leases. We have elected the short-term lease recognition exemption for all leases that qualify, meaning that for leases with terms of twelve months or less, we will not recognize right-of-use (ROU) assets or lease liabilities on our consolidated balance sheet. Additionally, we have elected to use the practical expedient to not separate lease and non-lease components for leases of real estate, meaning that for these leases, the non-lease components are included in the associated ROU asset and lease liability balances on our consolidated balance sheet.

The most significant impacts of adopting Topic 842 on our consolidated financial statements were (1) the recognition of new ROU assets and lease liabilities for our operating leases of $31.1 million and $34.9 million, respectively on January 1, 2019, which included reclassifying accrued rent as a component of the ROU asset, and (2) significant new disclosures about our leasing activities, which are provided in Note 13. Topic 842 did not have a material impact on our results of operations or cash flows.

In January 2017, the FASB issued ASU No. 2017-04, Simplifying the Test for Goodwill Impairment. The standard will remove step 2 from the goodwill impairment test. Under the ASU, an entity should perform its annual goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount and recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value, however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. ASU 2017-04 is effective for public companies for annual reporting periods beginning after December 15, 2019. Early adoption is permitted for goodwill impairment tests performed on testing dates after January 1, 2017. We adopted the standard on January 1, 2019. The adoption of the ASU did not have an effect on our results of operations, financial condition or cash flows.

Accounting Standards Not Yet Adopted

For a discussion of other accounting standards that have been issued by the FASB but are not yet effective, refer to the Recent Accounting Standards section in our Annual Report on Form 10-K for the year ended December 31, 2018. These standards are not expected to have a material impact on our results of operations, financial condition or cash flows.