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Debt - 2017 Credit Agreement (Details) |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 19, 2017 USD ($) | Jun. 30, 2017 | Jan. 19, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Nov. 30, 2017 | Jul. 18, 2017
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Repayments of Lines of Credit |  |  |  | $ 29,000,000 | $ 115,000,000 | $ 0 |  |
Loss on extinguishment of debt |  |  |  | $ 29,413,000 | $ 0 | $ 0 |  |
Revolving Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 200,000,000.0 |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Effective interest rate (as a percent) |  |  |  |  |  |  |  | 4.08%
First Amendment to 2017 Credit Agreement |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 100,000,000.0 |  |  |  |  |  |  |
Line of credit facility, sub-limit | $ 50,000,000 |  |  |  |  |  |  |
Interest coverage ratio |  |  |  | 2.00 |  |  |  |
Goldman Sachs Bank USA | Secured Debt |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | 900,000,000 |  |  |  |  |
Consent fee, percent |  | 0.15% |  |  |  |  |  |
Goldman Sachs Bank USA | First Amendment to 2017 Credit Agreement |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Collateral fees percentage | 0.25% |  |  |  |  |  |  |
Minimum | First Amendment to 2017 Credit Agreement |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Effective interest rate (as a percent) |  |  |  |  |  |  | 5.74% |
Maximum | First Amendment to 2017 Credit Agreement |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Effective interest rate (as a percent) |  |  |  |  |  |  | 5.76% |
Leverage Tranche One | First Amendment to 2017 Credit Agreement |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Net leverage ratio |  |  |  | 5.50 |  |  |  |
Leverage Tranche Two | First Amendment to 2017 Credit Agreement |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Net leverage ratio |  |  |  | 5.00 |  |  |  |
Leverage Tranche Three | First Amendment to 2017 Credit Agreement |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Net leverage ratio |  |  |  | 4.25 |  |  |  |
2017 Credit Agreement |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Fee amount |  |  |  | $ 16,800,000 |  |  |  |
Repayments of Lines of Credit |  |  |  | 897,500,000 |  |  |  |
Loss on extinguishment of debt |  |  |  | $ 29,400,000 |  |  |  |
2017 Credit Agreement | Goldman Sachs Bank USA | Revolving Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | 200,000,000 |  |  |  |  |
2017 Credit Agreement | Goldman Sachs Bank USA | Secured Debt |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 900,000,000 |  |  |  |  |
Amortization percent per year |  |  | 1.00% |  |  |  |  |
Mandatory prepayment, covenant one |  |  | 100.00% |  |  |  |  |
Mandatory prepayment, covenant two |  |  | 100.00% |  |  |  |  |
2017 Credit Agreement | London Interbank Offered Rate (LIBOR) | Goldman Sachs Bank USA | Revolving Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 2.50% |  |  |  |  |
2017 Credit Agreement | London Interbank Offered Rate (LIBOR) | Goldman Sachs Bank USA | Secured Debt |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 2.75% |  |  |  |  |
2017 Credit Agreement | Base Rate | Goldman Sachs Bank USA | Revolving Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.50% |  |  |  |  |
2017 Credit Agreement | Base Rate | Goldman Sachs Bank USA | Secured Debt |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.75% |  |  |  |  |
2017 Credit Agreement | Minimum | Goldman Sachs Bank USA | Revolving Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Commitment fee percentage |  |  | 0.25% |  |  |  |  |
2017 Credit Agreement | Maximum | Goldman Sachs Bank USA | Revolving Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Commitment fee percentage |  |  | 0.375% |  |  |  |  |
Term Loans | First Amendment to 2017 Credit Agreement |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Net leverage ratio |  |  |  | 5.00 |  |  |  |
Retroactive increase, percent |  |  |  | 0.25% |  |  |  |
Net revenue variance, percentage |  |  |  | 15.00% |  |  |  |
Term Loans | London Interbank Offered Rate (LIBOR) | First Amendment to 2017 Credit Agreement |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 4.50% |  |  |  |
Interest rate, as a percent |  |  |  | 1.00% |  |  |  |
Term Loans | Base Rate | First Amendment to 2017 Credit Agreement |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 3.50% |  |  |  |
Interest rate, as a percent |  |  |  | 2.00% |  |  |  |
Term Loans | Less Than or Equal To 5.00 | London Interbank Offered Rate (LIBOR) | First Amendment to 2017 Credit Agreement |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 5.75% |  |  |  |
Term Loans | Less Than or Equal To 5.00 | Base Rate | First Amendment to 2017 Credit Agreement |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 4.75% |  |  |  |
Term Loans | Greater Than 5.00 | London Interbank Offered Rate (LIBOR) | First Amendment to 2017 Credit Agreement |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 6.75% |  |  |  |
Term Loans | Greater Than 5.00 | Base Rate | First Amendment to 2017 Credit Agreement |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 5.75% |  |  |  |
Revolving Loans | London Interbank Offered Rate (LIBOR) | First Amendment to 2017 Credit Agreement |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 4.50% |  |  |  |
Interest rate, as a percent |  |  |  | 1.00% |  |  |  |
Revolving Loans | Base Rate | First Amendment to 2017 Credit Agreement |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 3.50% |  |  |  |
Interest rate, as a percent |  |  |  | 2.00% |  |  |  |
Prepaid with Proceeds of Repricing Transaction | Term Loans | First Amendment to 2017 Credit Agreement |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Prepayment fee percentage |  |  |  | 1.00% |  |  |  |
Voluntary Prepayments Through One-Year Anniversary of Initial Period End Date | Term Loans | First Amendment to 2017 Credit Agreement |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Prepayment fee percentage |  |  |  | 2.00% |  |  |  |
Voluntary Prepayments After One-Year Anniversary of Initial Period End Date | Term Loans | First Amendment to 2017 Credit Agreement |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Prepayment fee percentage |  |  |  | 1.00% |  |  |  |

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