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Comprehensive Income (Details 2) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Foreign Currency Translation Adjustments, Beginning balance $ (5,489)  
Foreign Currency Translation Adjustments, Other comprehensive loss before reclassifications 419  
Foreign Currency Translation Adjustments, Amounts reclassified from accumulated other comprehensive loss 0  
Foreign Currency Translation Adjustments, Net current period other comprehensive income 419  
Foreign Currency Translation Adjustments, Ending balance (5,070)  
Defined Benefit Pension Items, Beginning balance (11,080)  
Defined Benefit Pension Items, Other comprehensive loss before reclassifications 0  
Defined Benefit Pension Items, Amounts reclassified from accumulated other comprehensive loss 73 $ 221
Defined Benefit Pension Items, Net current period other comprehensive income 73  
Defined Benefit Pension Items, Ending balance (11,007)  
Beginning balance (16,569)  
Other comprehensive loss before reclassifications 419  
Amounts reclassified from accumulated other comprehensive loss 73  
Net current period other comprehensive (loss) income 492  
Ending balance $ (16,077)