Fair Value of Financial Instruments (Summary of Carrying Amounts and Estimated Fair Values of Long-Term Debt) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total debt, excluding unamortized debt issuance costs and discounts, Carrying Amount	$ 1,366,480	$ 1,295,589
Total debt, excluding unamortized debt issuance costs and discounts, Estimated Fair Value	1,297,621	1,211,317
ABL Credit Facility, maturing 2021 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total debt, excluding unamortized debt issuance costs and discounts, Carrying Amount	39,000	0
Total debt, excluding unamortized debt issuance costs and discounts, Estimated Fair Value	39,000	0
Senior Notes, maturing 2023 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total debt, excluding unamortized debt issuance costs and discounts, Carrying Amount	400,000	400,000
Total debt, excluding unamortized debt issuance costs and discounts, Estimated Fair Value	349,456	334,720
Other debt [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total debt, excluding unamortized debt issuance costs and discounts, Carrying Amount	26,611	27,170
Total debt, excluding unamortized debt issuance costs and discounts, Estimated Fair Value	26,611	27,170
Senior Credit Facility [Member] | Revolving Credit Facility, maturing 2021 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total debt, excluding unamortized debt issuance costs and discounts, Carrying Amount	39,000	0
Total debt, excluding unamortized debt issuance costs and discounts, Estimated Fair Value	39,000	0
Senior Credit Facility [Member] | Term Loan Facility, maturing 2022 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total debt, excluding unamortized debt issuance costs and discounts, Carrying Amount	861,869	868,419
Total debt, excluding unamortized debt issuance costs and discounts, Estimated Fair Value	$ 843,554	$ 849,427