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Comprehensive Income (Details 2) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Foreign Currency Translation Adjustments, Beginning balance     $ (5,691)  
Foreign Currency Translation Adjustments, Other comprehensive income before reclassifications     970  
Foreign Currency Translation Adjustments, Amounts reclassified from accumulated other comprehensive loss     0  
Foreign Currency Translation Adjustments, Net current period other comprehensive income     970  
Foreign Currency Translation Adjustments, Ending balance $ (4,721)   (4,721)  
Defined Benefit Pension Items, Beginning balance     (12,776)  
Defined Benefit Pension Items, Other comprehensive income before reclassifications     0  
Defined Benefit Pension Items, Amounts reclassified from accumulated other comprehensive loss 256 $ 272 767 $ 815
Defined Benefit Pension Items, Net current period other comprehensive income     767  
Defined Benefit Pension Items, Ending balance (12,009)   (12,009)  
Beginning balance     (18,467)  
Other comprehensive income before reclassifications     970  
Amounts reclassified from accumulated other comprehensive loss     767  
Net current period other comprehensive income     1,737  
Ending balance $ (16,730)   $ (16,730)