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Summary of Significant Accounting Policies (Schedule of ASU 2017-07 Adoption) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Item Effected [Line Items]    
Cost of sales $ 320,146 $ 406,478
Selling, general and administrative expenses 29,051 32,987
Restructuring and impairment charges   1,792
Other income $ 1,848 539
As Reported [Member]    
Item Effected [Line Items]    
Cost of sales   406,143
Selling, general and administrative expenses   32,911
Restructuring and impairment charges   2,212
Other income   548
Reclassifications [Member]    
Item Effected [Line Items]    
Cost of sales   335
Selling, general and administrative expenses   76
Restructuring and impairment charges   (420)
Other income   $ (9)