Long-Term Debt (Summary of Components of Long-Term Debt) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Apr. 29, 2016	Apr. 27, 2016
Debt Instrument [Line Items]
Total debt, excluding debt issuance costs and discounts	$ 1,366,480	$ 1,295,589
Unamortized debt issuance costs and discounts	(46,831)	(48,764)
Capital lease obligations	25,224	25,588
Other debt	1,387	1,582
Total debt	1,319,649	1,246,825
Less: Current maturities of long-term debt	(1,664)	(5,683)
Long-term debt	1,317,985	1,241,142	$ 1,250,497	$ 24,179
Senior Notes, maturing 2023 [Member]
Debt Instrument [Line Items]
Total debt, excluding debt issuance costs and discounts	400,000	400,000
ABL Credit Facility, maturing 2021 [Member]
Debt Instrument [Line Items]
Total debt, excluding debt issuance costs and discounts	39,000	0
Senior Credit Facility [Member] | Revolving Credit Facility, maturing 2021 [Member]
Debt Instrument [Line Items]
Total debt, excluding debt issuance costs and discounts	39,000	0
Senior Credit Facility [Member] | Term Loan Facility, maturing 2022 [Member]
Debt Instrument [Line Items]
Total debt, excluding debt issuance costs and discounts	$ 861,869	$ 868,419