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Comprehensive Income (Details 2) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Foreign Currency Translation Adjustments, Beginning balance $ (4,186)  
Foreign Currency Translation Adjustments, Other comprehensive loss before reclassifications (85)  
Foreign Currency Translation Adjustments, Amounts reclassified from accumulated other comprehensive loss 0  
Foreign Currency Translation Adjustments, Net current period other comprehensive (loss) income (85)  
Foreign Currency Translation Adjustments, Ending balance (4,271)  
Defined Benefit Pension Items, Beginning balance (13,673)  
Defined Benefit Pension Items, Other comprehensive loss before reclassifications 0  
Defined Benefit Pension Items, Amounts reclassified from accumulated other comprehensive loss 118 $ 73
Defined Benefit Pension Items, Net current period other comprehensive (loss) income 118  
Defined Benefit Pension Items, Ending balance (13,555)  
Beginning balance (17,859)  
Other comprehensive loss before reclassifications (85)  
Amounts reclassified from accumulated other comprehensive loss 118  
Net current period other comprehensive (loss) income 33  
Ending balance $ (17,826)