Senior Debt (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($)	Oct. 04, 2016 USD ($)	Sep. 30, 2016	Dec. 31, 2015 USD ($)
Debt Instrument [Line Items]
Senior Credit Facility Maximum Amount			$ 900,000,000
Mandatory Excess Cash Flow Pre-Payment	$ 27,000,000
Term loan, maximum facility			225,000,000
Revolving facility, maximum facility			675,000,000
Senior credit facilities, maximum facility			900,000,000			$ 900,000,000
Senior credit facilities, amount outstanding			191,813,000			411,063,000
Senior credit facilities, amount available			584,304,000			390,300,000
Debt facilities, maximum facility			920,000,000			920,000,000
Debt facilities, amount outstanding			191,813,000			425,633,000
Debt facilities, amount available			604,304,000			395,730,000
Unamortized Debt Issuance Expense			(5,066,000)	$ (1,000,000)		(5,985,000)
Letters of credit, amount outstanding			$ 90,700,000			94,700,000
Line of Credit Facility, Interest Rate Description			Borrowings under the Revolving Facility bear interest at varying rates
Commitment fee percentage			0.45%
Senior Credit Facilities, Additional Amount Allowed			$ 250,000,000
Debt Instrument, Covenant, Total Leverage Ratio Maximum, Ability to Repurchase Stock, Notes, or Pay Dividends			2.5
Debt Instrument, Covenant, Total Leverage Ratio Maximum, Ability to Repurchase Stock, Notes, or Pay Dividends, Dividend Exception Amount			$ 20,000,000
Schedule Maturity Dates (Table Details) [Abstract]
2017			2,250,000
2018			2,250,000
2019			2,250,000
2020			2,250,000
2021			182,813,000
Thereafter			0
Long-term Debt			191,813,000
Senior debt, net			$ 186,747,000			419,648,000
Initial Borrowing in Term Loans		$ 225,000,000
Initial Borrowing in Revolving Debt		$ 100,000,000
Term Loan, Frequency of Periodic Payment			quarterly
Term Loan, Periodic Payment, Principal			$ 562,500
Event of default - 3rd party ownership % of our voting stock			35.00%
Event of default - judgment not satisfied or bonded pending appeal			$ 50,000,000
Event of default - maximum period allowed for pending judgment					30
Financial Covenants Ratios (Table Details) [Abstract]
Required consolidated leverage ratio, maximum			4.00		4.25
Actual consolidated leverage ratio			3.58
Required Consolidated Senior Secured Leverage Ratio, Maximum			2.50		2.75
Actual Consolidated Senior Secured Leverage Ratio			0.65
Required Consolidated Fixed Charge Coverage Ratio, Minimum			1.50
Actual fixed charge coverage ratio			1.50
Covenants [Abstract]
Consolidated funded debt outstanding			$ 664,200,000
Consolidated EBITDA			185,500,000
Covenant limitation incur additional debt in excess of			25,000,000
Consolidated senior secured debt outstanding			121,400,000
Adjusted Consolidated EBITDA			416,700,000
Consolidated fixed charges			$ 277,900,000
Minimum [Member]
Debt Instrument [Line Items]
Commitment fee percentage			0.30%
Maximum [Member]
Debt Instrument [Line Items]
Commitment fee percentage			0.50%
Eurodollar Rate [Member]
Debt Instrument [Line Items]
Description of variable rate basis			Eurodollar
Eurodollar Rate [Member] | Minimum [Member]
Debt Instrument [Line Items]
Basis margin on variable rate			1.50%
Eurodollar Rate [Member] | Maximum [Member]
Debt Instrument [Line Items]
Basis margin on variable rate			2.75%
Prime Rate [Member]
Debt Instrument [Line Items]
Description of variable rate basis			prime
Prime Rate [Member] | Minimum [Member]
Debt Instrument [Line Items]
Basis margin on variable rate			0.50%
Prime Rate [Member] | Maximum [Member]
Debt Instrument [Line Items]
Basis margin on variable rate			1.75%
Term Loan [Member]
Debt Instrument [Line Items]
Maturity date			Mar. 19, 2021
Term loan, maximum facility			$ 225,000,000			225,000,000
Term loan, amount outstanding			191,813,000			221,063,000
Term loan, amount available			$ 0			0
Margin on Eurodollar rate, actual			3.00%
Margin on ABR rate, actual			2.00%
Schedule Maturity Dates (Table Details) [Abstract]
2017			$ 2,250,000
2018			2,250,000
2019			2,250,000
2020			2,250,000
2021			182,813,000
Thereafter			0
Long-term Debt			$ 191,813,000
Revolving Facility [Member]
Debt Instrument [Line Items]
Maturity date			Mar. 19, 2019
Revolving facility, maximum facility			$ 675,000,000			675,000,000
Revolving facility, amount outstanding			0			190,000,000
Revolving facility, amount available			$ 584,304,000			390,300,000
Margin on Eurodollar rate, actual			2.25%
Margin on ABR rate, actual			1.25%
Schedule Maturity Dates (Table Details) [Abstract]
2017			$ 0
2018			0
2019			0
2020			0
2021			0
Thereafter			0
Long-term Debt			$ 0
Line of Credit [Member]
Debt Instrument [Line Items]
Maturity date			Aug. 21, 2017
Revolving facility, maximum facility			$ 20,000,000			20,000,000
Revolving facility, amount outstanding			0			14,570,000
Revolving facility, amount available			20,000,000			$ 5,430,000
Schedule Maturity Dates (Table Details) [Abstract]
2017			0
2018			0
2019			0
2020			0
2021			0
Thereafter			0
Long-term Debt			$ 0
Line of Credit [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate of senior notes			2.00%