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Acquisitions Pro Forma Infromation (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]                      
Net sales $ 124,680 $ 107,470 $ 111,853 $ 104,056 $ 108,931 $ 165,092 $ 172,134 $ 143,512 $ 448,059 $ 589,669 $ 841,253
Net income $ 15,312 $ 13,151 $ 18,893 $ 15,448 $ 15,295 $ 18,602 $ 18,311 $ 14,003 $ 62,804 $ 66,211 70,058
FTT Assets                      
Business Acquisition [Line Items]                      
Net sales                     854,842
Net income                     70,824
Greenville-Mount Pleasant Assets                      
Business Acquisition [Line Items]                      
Net sales                     841,943
Net income                     $ 69,621