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Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Pension Liability Adjustment, Other comprehensive income (loss):    
Pension Liability Adjustment, Balance at Beginning of the Period $ 1,191 $ 1,387
Pension Liability Adjustment, Other comprehensive income (loss) before reclassifications, net of taxes 0 0
Pension Liability Adjustment, Total other comprehensive income (loss) before reclassifications, net of taxes 1,191 1,387
Pension Liability Adjustment, Net amount reclassified to earnings (59) (62)
Pension Liability Adjustment, Balance at End of the Period 1,132 1,325
Fair Value of Derivatives, Other comprehensive income (loss):    
Fair Value of Derivatives, Balance at Beginning of the Period 342 (318)
Fair Value of Derivatives, Other comprehensive income (loss) before reclassifications, net of taxes (536) 233
Fair Value of Derivatives, Total other comprehensive income (loss) before reclassifications, net of taxes (194) (85)
Fair Value of Derivatives, Net amount reclassified to earnings 5 78
Fair Value of Derivatives, Balance at End of the Period (189) (7)
Foreign Currency Translation Adjustment, Other comprehensive income (loss):    
Foreign Currency Translation Adjustment, Balance at Beginning of the Period (687) (1,393)
Foreign Currency Translation Adjustment, Other comprehensive income (loss) before reclassifications, net of taxes (28) 24
Foreign Currency Translation Adjustment, Total other comprehensive income (loss) before reclassifications, net of taxes (715) (1,369)
Foreign Currency Translation Adjustment, Net amount reclassified to earnings 0 0
Foreign Currency Translation Adjustment, Balance at End of the period (715) (1,369)
Accumulated Other Comprehensive Income (Loss), Other comprehensive income (loss):    
Accumulated Other Comprehensive Income (Loss), Balance at Beginning of the period 846 (324)
Accumulated Other Comprehensive Income (Loss), Other comprehensive income (loss) before reclassifications, net of taxes (564) 257
Accumulated Other Comprehensive Income (Loss), Total other comprehensive income (loss) before reclassifications, net of taxes 282 (67)
Accumulated Other Comprehensive Income (Loss), Net amount reclassified to earnings (54) 16
Accumulated Other Comprehensive Income (Loss), Balance at End of the period $ 228 $ (51)