Debt and Financing-Debt Balances (Details) - USD ($) $ in Thousands		Sep. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term debt		$ 594,062	$ 679,177
Deferred loan costs, Term Loan A		3,486	4,264
Less: current portion of long-term debt		(799)	(35,514)
Deferred loan costs, current portion of long-term debt		0	68
Long-term debt, less current portion		593,263	643,663
Revolving line of credit	[1],[2]	50,000	200,000
Long-term debt, including revolving line of credit		644,062	879,177
Letters of Credit Outstanding, Amount		97,000	95,000
2015 Agreement, New Term Loan A [Member]
Debt Instrument [Line Items]
Long-term debt	[1],[3]	592,819	668,055
Deferred loan costs, Term Loan A		1,431	1,695
Other [Member]
Debt Instrument [Line Items]
Long-term debt		$ 1,243	$ 11,122

[1] Refer to Note 15 for information regarding the fair value of long-term debt.

[2] The Company additionally had outstanding letters of credit, primarily related to workers' compensation and self-insurance liabilities of $97.0 million and $95.0 million under the New Revolver at September 30, 2016 and December 31, 2015, respectively.

[3] The New Term Loan A is included in "Current portion of long-term debt" and "Long-term debt, less current portion." Carrying value is net of $1.4 million and $1.7 million DLCs as of September 30, 2016 and December 31, 2015, respectively.