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Debt - Amendment to Senior Secured Credit Facility - 2024 Term Loan (Details) $ in Thousands |  |  | 6 Months Ended
--- | --- | --- | ---
Feb. 01, 2018 USD ($) | Jan. 31, 2018 | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |
Repayments of debt |  |  | $ 671,721 | $ 2,415,530
Lines of credit | Second Amended and Restated Credit Agreement | Term Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of debt | $ 350,000 |  |  |
Cash interest payments | $ 1,239 |  |  |
Repurchase price, percent | 1.00% |  |  |
Lines of credit | Second Amended and Restated Credit Agreement | Term Loan | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable interest rate, increase (decrease) | (0.01) |  |  |
Lines of credit | Second Amended and Restated Credit Agreement | Term Loan | Maximum | London Interbank Offered Rate (LIBOR) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 3.50% | 4.50% |  |
Lines of credit | Second Amended and Restated Credit Agreement | Term Loan | Minimum | Alternate Base Rate (ABR) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 2.50% | 3.50% |  |

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