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Shareholders' Equity Part 2 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Loss      
Balance at the beginning of the year $ (49,923) $ (48,129)  
Other comprehensive income (loss) before reclassifications 11,947    
Amounts reclassified from Accumulated Other Comprehensive Loss 15,653    
Net current period other comprehensive income (loss) (27,600) 1,794 $ 9,536
Balance at the end of the year (22,323) (49,923) $ (48,129)
Foreign Currency Translation Adjustments      
Accumulated Other Comprehensive Loss      
Balance at the beginning of the year (44,444)    
Other comprehensive income (loss) before reclassifications 28,666    
Amounts reclassified from Accumulated Other Comprehensive Loss 0    
Net current period other comprehensive income (loss) (28,666)    
Balance at the end of the year (15,778) (44,444)  
Pension and Postretirement Benefits      
Accumulated Other Comprehensive Loss      
Balance at the beginning of the year (5,391)    
Other comprehensive income (loss) before reclassifications (300)    
Amounts reclassified from Accumulated Other Comprehensive Loss 4,081    
Net current period other comprehensive income (loss) (3,781)    
Balance at the end of the year (1,610) (5,391)  
Cash Flow Hedge      
Accumulated Other Comprehensive Loss      
Balance at the beginning of the year (88)    
Other comprehensive income (loss) before reclassifications (16,419)    
Amounts reclassified from Accumulated Other Comprehensive Loss 11,572    
Net current period other comprehensive income (loss) 4,847    
Balance at the end of the year $ (4,935) $ (88)