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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance $ (183,234) $ (208,719)  
Other comprehensive income (loss) before reclassifications (304) 15,796  
Amounts reclassified from accumulated other comprehensive income (loss) 6,869 9,689  
Other comprehensive income (loss) 6,565 25,485 $ (58,524)
Ending balance (176,669) (183,234) (208,719)
Foreign currency translation adjustment      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (93,970) (112,807)  
Other comprehensive income (loss) before reclassifications 7,792 18,837  
Amounts reclassified from accumulated other comprehensive income (loss) 0 0  
Other comprehensive income (loss) 7,792 18,837  
Ending balance (86,178) (93,970) (112,807)
Gain (loss) on derivative financial instruments      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance 863 (373)  
Other comprehensive income (loss) before reclassifications 538 247  
Amounts reclassified from accumulated other comprehensive income (loss) (942) 989  
Other comprehensive income (loss) (404) 1,236  
Ending balance 459 863 (373)
Pension and other post-retirement benefit adjustments      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (90,127) (95,539)  
Other comprehensive income (loss) before reclassifications (8,634) (3,288)  
Amounts reclassified from accumulated other comprehensive income (loss) 7,811 8,700  
Other comprehensive income (loss) (823) 5,412  
Ending balance $ (90,950) $ (90,127) $ (95,539)