Bank Credit Agreements and Other Short-Term and Long-Term Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Total long-term debt	$ 429,841	$ 466,223
Current portion of long-term debt	(14,356)	(10,282)
Less: Unamortized debt issuance costs	(2,359)	(2,203)
Long-term debt, net of current portion	413,126	453,738
Notes Payable To Bank
Debt Instrument [Line Items]
Total long-term debt	1,466	1,723
Term Loan and Revolver
Debt Instrument [Line Items]
Total long-term debt	$ 428,375	$ 464,500