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%