Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Senior debt:
Total senior debt	$ 202,895
Less: Debt issuance costs and discount	(3,485)	$ (4,861)
Total debt, net of debt issuance costs and discount	199,410	445,589
Less: Current maturities	(9,950)	(445,589)
Total debt, net of current maturities	189,460	0
Revolving credit facility
Senior debt:
Total senior debt	0	172,700
Term loans
Senior debt:
Total senior debt	0	277,750
Senior Notes
Senior debt:
Total senior debt	0	450,450
ABL Facility
Senior debt:
Total senior debt	202,895	0
ABL Facility | Revolving credit facility
Senior debt:
Total senior debt	147,037	0
Term Loan Facility
Senior debt:
Total senior debt	$ 55,858	$ 0