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Debt (Details 2) - USD ($) $ in Thousands	Jun. 30, 2018		Dec. 31, 2017
Debt Instrument
Total Debt	$ 365,110		$ 383,279
Debt Instrument, Unamortized Debt Issuance Costs, Noncurrent, net	(5,442)		(6,440)
Capital Lease Obligations, Current	(1,358)	[1]	(1,470)
Long-Term Portion	328,699		345,956
Current Portion of Long-Term Debt	30,969		30,883
Line of Credit
Debt Instrument
Debt, Current, Net Of Unamortized Debt Issuance Costs	(29,611)	[1]	(29,413)
Current Portion of Long-Term Debt	30,000
Debt Instrument, Unamortized Debt Issuance Costs, Current Portion, net	389
Capital Lease Obligations
Debt Instrument
Total Debt	3,110		3,279
JPMorgan, 2017 Credit Agreement | Line of Credit
Debt Instrument
Total Debt	62,000		80,000
Bonds
Debt Instrument
Total Debt	$ 300,000		$ 300,000
[1] (1) Current maturities of long-term debt include $30,000 of current maturities, less $389 of unamortized debt issuance costs, under our 2017 Credit Agreement and $1,358 of current maturities of capital lease obligations.

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