Long-Term Debt and Credit Arrangements (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Revolving credit facility	$ 103,884	$ 70,583
Notes payable - buildings	12,601	13,150
Acquisition note payable - Development Authority of Gordon County	119	1,147
Acquisition note payable - Robertex	786	1,564
Notes payable - equipment and other	9,473	11,633
Capital lease obligations	12,353	11,145
Deferred financing costs, net	(710)	(844)
Total long-term debt	138,506	108,378
Less: current portion of long-term debt	9,721	10,122
Long-term debt	$ 128,785	$ 98,256