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Recent Accounting Pronouncements (Schedule of ASU 2017-07 Adoption) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Item Effected [Line Items]        
Cost of sales $ 82,806 $ 79,947 $ 228,279 $ 323,104
Selling, general and administrative expenses 5,448 10,734 21,829 23,686
Restructuring and impairment charges 0 59 0 1,785
Other income $ 452 335 $ 1,421 219
As Reported [Member]        
Item Effected [Line Items]        
Cost of sales   79,863   322,853
Selling, general and administrative expenses   10,715   23,629
Restructuring and impairment charges       2,205
Other income   232   331
Reclassifications [Member]        
Item Effected [Line Items]        
Cost of sales   84   251
Selling, general and administrative expenses   19   57
Restructuring and impairment charges       (420)
Other income   $ 103   $ (112)