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Debt Obligations - Additional Information on Repurchase of Outstanding Unsecured Notes (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Extinguishment Of Debt [Line Items] |  |  |  |
Principal |  | $ 0 | $ 325,000,000.0 | $ 0
Repurchase Amount |  | 0 | 628,590,000 | 149,919,000
Loss on early extinguishment of debt |  | (105,000) | $ (3,933,000) | $ (66,590,000)
Notes 2018 [Member] |  |  |  |
Extinguishment Of Debt [Line Items] |  |  |  |
Principal |  | 325,000,000 |  |
Repurchase Amount | [1] | 330,792,000 |  |
Loss on early extinguishment of debt | [2] | $ (3,933,000) |  |
[1] | Includes prepayment penalties with respect to the redemption of debt.
[2] | Includes unamortized balance of the original issue discount and deferred financing costs.

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- Definition The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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