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Summary of Significant Accounting Policies (Schedule of Accumulated Other Comprehensive Income (loss)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance $ (208,719) $ (150,195)  
Other comprehensive income (loss) before reclassifications 15,796 (70,934)  
Amounts reclassified from accumulated other comprehensive income (loss) 9,689 12,410  
Other comprehensive income (loss) 25,485 (58,524) $ (59,907)
Ending balance (183,234) (208,719) (150,195)
Foreign currency translation adjustment      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (112,807) (47,270)  
Other comprehensive income (loss) before reclassifications 18,837 (65,537)  
Amounts reclassified from accumulated other comprehensive income (loss) 0 0  
Other comprehensive income (loss) 18,837 (65,537)  
Ending balance (93,970) (112,807) (47,270)
Gain (loss) on derivative financial instruments      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (373) 656  
Other comprehensive income (loss) before reclassifications 247 (3,221)  
Amounts reclassified from accumulated other comprehensive income (loss) 989 2,192  
Other comprehensive income (loss) 1,236 (1,029)  
Ending balance 863 (373) 656
Pension and other post-retirement benefit adjustments      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (95,539) (103,581)  
Other comprehensive income (loss) before reclassifications (3,288) (2,176)  
Amounts reclassified from accumulated other comprehensive income (loss) 8,700 10,218  
Other comprehensive income (loss) 5,412 8,042  
Ending balance $ (90,127) $ (95,539) $ (103,581)