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Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Aug. 19, 2016	Aug. 16, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Capital leases	$ 2,924			$ 2,215
Revolving Credit Agreement	0			0
Total debt	952,924			552,215
Debt issuance costs on senior unsecured notes	(16,697)			(9,092)
Premium on senior unsecured notes	8,042			4,660
Less: current portion	(1,543)			(951)
Total long-term debt	942,726			546,832
Senior Notes \| 7.500% senior unsecured notes due 2022
Debt Instrument [Line Items]
Senior unsecured notes	$ 550,000			550,000
Debt instrument interest rate stated percentage	7.50%
Senior Notes \| 6.250% senior unsecured notes due 2024
Debt Instrument [Line Items]
Senior unsecured notes	$ 400,000			$ 0
Premium on senior unsecured notes		$ 4,000
Debt instrument interest rate stated percentage	6.25%		6.25%