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Comprehensive Income (Details 2) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Foreign Currency Translation Adjustments, Beginning balance     $ (5,489)  
Foreign Currency Translation Adjustments, Other comprehensive income before reclassifications     918  
Foreign Currency Translation Adjustments, Amounts reclassified from accumulated other comprehensive loss     0  
Foreign Currency Translation Adjustments, Net current period other comprehensive income     918  
Foreign Currency Translation Adjustments, Ending balance $ (4,571)   (4,571)  
Defined Benefit Pension Items, Beginning balance     (11,080)  
Defined Benefit Pension Items, Other comprehensive income before reclassifications     0  
Defined Benefit Pension Items, Amounts reclassified from accumulated other comprehensive loss 88 $ 290 161 $ 511
Defined Benefit Pension Items, Net current period other comprehensive income     161  
Defined Benefit Pension Items, Ending balance (10,919)   (10,919)  
Beginning balance     (16,569)  
Other comprehensive income before reclassifications     918  
Amounts reclassified from accumulated other comprehensive loss     161  
Net current period other comprehensive income     1,079  
Ending balance $ (15,490)   $ (15,490)