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Segment Information (Schedule of Segment Reporting Information, by Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]                      
Revenues $ 79,241 $ 72,025 $ 118,672 $ 139,536 $ 135,523 $ 113,461 $ 126,157 $ 148,590 $ 409,474 $ 523,731 $ 772,854
Operating (Loss) Income                 (31,792) 15,848 46,763
Consolidated interest expense and deferred financing costs                 (163) (171) (243)
Consolidated other income                 548 111 116
(Loss) income before income taxes                 (31,407) 15,788 46,636
Depreciation and amortization                 9,366 9,736 10,028
Capital expenditures                 967 13,846 16,699
Manufacturing [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 400,481 516,063 745,723
Operating (Loss) Income                 (6,998) 29,012 69,165
Depreciation and amortization                 8,642 8,328 7,170
Capital expenditures                 624 13,079 15,176
Corporate and Other [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 8,993 7,668 27,131
Operating (Loss) Income                 (24,794) (13,164) (22,402)
Depreciation and amortization                 724 1,408 2,858
Capital expenditures                 $ 343 $ 767 $ 1,523