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Business Realignment and Corporate Headquarter Relocation (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Apr. 25, 2016
Selling, General and Administrative Expenses [Member] | Corporate Headquarter Relocation [Member]          
Restructuring Cost and Reserve [Line Items]          
Grant income $ 338   $ 338    
Selling, General and Administrative Expenses [Member] | Headquarter Relocation [Member]          
Restructuring Cost and Reserve [Line Items]          
Headquarter relocation costs   $ 272   $ 272  
Maximum [Member] | Corporate Headquarter Relocation [Member]          
Restructuring Cost and Reserve [Line Items]          
Grant awarded         $ 1,400