Debt - Credit Agreement (Details)			3 Months Ended		12 Months Ended
	Jul. 19, 2017 USD ($)	Jan. 19, 2017 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($)	Nov. 30, 2017	Oct. 13, 2017	Jul. 18, 2017	Aug. 12, 2014
Line of Credit Facility [Line Items]
Aggregate payoff			$ 29,000,000	$ 0
2017 Credit Agreement | Subsequent Event
Line of Credit Facility [Line Items]
Debt Instrument, Fee Amount					$ 16,800,000
Aggregate payoff					897,500,000
Loss on extinguishment of debt					$ 29,400,000
Revolving Facility
Line of Credit Facility [Line Items]
Borrowing capacity		$ 200,000,000.0
Revolving Facility | 2017 Credit Agreement | Goldman Sachs Bank USA
Line of Credit Facility [Line Items]
Borrowing capacity		$ 200,000,000
Revolving Facility | LIBOR | 2017 Credit Agreement | Goldman Sachs Bank USA
Line of Credit Facility [Line Items]
Variable rate basis spread (as a percent)		2.50%
Revolving Facility | Base Rate | 2017 Credit Agreement | Goldman Sachs Bank USA
Line of Credit Facility [Line Items]
Variable rate basis spread (as a percent)		1.50%
First Amendment to 2017 Credit Agreement
Line of Credit Facility [Line Items]
Interest Coverage Ratio			2.00
First Amendment to 2017 Credit Agreement | Subsequent Event
Line of Credit Facility [Line Items]
Borrowing capacity	$ 100,000,000.0
Line of Credit Facility, Sub-limit	$ 50,000,000.0
First Amendment to 2017 Credit Agreement | Subsequent Event | Goldman Sachs Bank USA
Line of Credit Facility [Line Items]
Line of Credit, Collateral Fees Percentage	0.25%
First Amendment to 2017 Credit Agreement | Term Loans
Line of Credit Facility [Line Items]
Net Leverage Ratio			5.00
Retroactive Increase (as a percent)			0.25%
Net Revenue Variance (as a percent)			15.00%
First Amendment to 2017 Credit Agreement | Leverage Tranche One
Line of Credit Facility [Line Items]
Net Leverage Ratio			5.50
First Amendment to 2017 Credit Agreement | Leverage Tranche Two
Line of Credit Facility [Line Items]
Net Leverage Ratio			5.00
First Amendment to 2017 Credit Agreement | Leverage Tranche Three
Line of Credit Facility [Line Items]
Net Leverage Ratio			4.25
First Amendment to 2017 Credit Agreement | Minimum | Subsequent Event
Line of Credit Facility [Line Items]
Effective interest rate (as a percent)						5.74%
First Amendment to 2017 Credit Agreement | Maximum | Subsequent Event
Line of Credit Facility [Line Items]
Effective interest rate (as a percent)						5.76%
First Amendment to 2017 Credit Agreement | Prepaid with Proceeds of Repricing Transaction | Term Loans
Line of Credit Facility [Line Items]
Debt Instrument, Prepayment Fee Percentage			1.00%
First Amendment to 2017 Credit Agreement | Voluntary Prepayments Through One-Year Anniversary of Initial Period End Date | Term Loans
Line of Credit Facility [Line Items]
Debt Instrument, Prepayment Fee Percentage			2.00%
First Amendment to 2017 Credit Agreement | Voluntary Prepayments After One-Year Anniversary of Initial Period End Date | Term Loans
Line of Credit Facility [Line Items]
Debt Instrument, Prepayment Fee Percentage			1.00%
First Amendment to 2017 Credit Agreement | LIBOR | Term Loans
Line of Credit Facility [Line Items]
Interest rate (as a percent)			1.00%
Variable rate basis spread (as a percent)			4.50%
First Amendment to 2017 Credit Agreement | LIBOR | Revolving Loans
Line of Credit Facility [Line Items]
Interest rate (as a percent)			1.00%
Variable rate basis spread (as a percent)			4.50%
First Amendment to 2017 Credit Agreement | Base Rate | Term Loans
Line of Credit Facility [Line Items]
Interest rate (as a percent)			2.00%
Variable rate basis spread (as a percent)			3.50%
First Amendment to 2017 Credit Agreement | Base Rate | Revolving Loans
Line of Credit Facility [Line Items]
Interest rate (as a percent)			2.00%
Variable rate basis spread (as a percent)			3.50%
First Amendment to 2017 Credit Agreement | Less Than or Equal To 5.00 | LIBOR | Term Loans
Line of Credit Facility [Line Items]
Variable rate basis spread (as a percent)			5.75%
First Amendment to 2017 Credit Agreement | Less Than or Equal To 5.00 | Base Rate | Term Loans
Line of Credit Facility [Line Items]
Variable rate basis spread (as a percent)			4.75%
First Amendment to 2017 Credit Agreement | Greater Than 5.00 | LIBOR | Term Loans
Line of Credit Facility [Line Items]
Variable rate basis spread (as a percent)			6.75%
First Amendment to 2017 Credit Agreement | Greater Than 5.00 | Base Rate | Term Loans
Line of Credit Facility [Line Items]
Variable rate basis spread (as a percent)			5.75%
2017 Term Facility | Goldman Sachs Bank USA
Line of Credit Facility [Line Items]
Borrowing capacity		$ 900,000,000
2017 Term Facility | Subsequent Event
Line of Credit Facility [Line Items]
Effective interest rate (as a percent)								4.08%
2017 Term Facility | 2017 Credit Agreement | Goldman Sachs Bank USA
Line of Credit Facility [Line Items]
Borrowing capacity		$ 900,000,000
2017 Term Facility | LIBOR | 2017 Credit Agreement | Goldman Sachs Bank USA
Line of Credit Facility [Line Items]
Variable rate basis spread (as a percent)		2.75%
2017 Term Facility | Base Rate | 2017 Credit Agreement | Goldman Sachs Bank USA
Line of Credit Facility [Line Items]
Variable rate basis spread (as a percent)		1.75%
2019 Notes
Line of Credit Facility [Line Items]
Interest rate (as a percent)									0.75%
Effective interest rate (as a percent)			1.38%
2019 Notes | Subsequent Event
Line of Credit Facility [Line Items]
Debt Default, Percent of Holders							25.00%