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Comprehensive Income (Details 2) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 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     (820)  
Foreign Currency Translation Adjustments, Amounts reclassified from accumulated other comprehensive loss     0  
Foreign Currency Translation Adjustments, Amounts reclassified from noncontrolling interest     (1,111)  
Foreign Currency Translation Adjustments, Net current period other comprehensive (loss) income     (1,931)  
Foreign Currency Translation Adjustments, Ending balance $ (6,117)   (6,117)  
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 116 $ 80 352 $ 241
Defined Benefit Pension Items, Amounts reclassified from noncontrolling interest     0  
Defined Benefit Pension Items, Net current period other comprehensive (loss) income     352  
Defined Benefit Pension Items, Ending balance (13,321)   (13,321)  
Beginning balance     (17,859)  
Other comprehensive loss before reclassifications     (820)  
Amounts reclassified from accumulated other comprehensive loss     352  
Amounts reclassified from noncontrolling interest     (1,111)  
Net current period other comprehensive (loss) income     (1,579)  
Ending balance $ (19,438)   $ (19,438)