Accumulated Other Comprehensive Income (Loss) by Component - Changes in Accumulated Comprehensive Income (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 $ (9,387) $ 71,619  
OCI before reclassifications (8,489) (80,151)  
Amount reclassified from accumulated OCI (1,459) (855)  
Other Comprehensive Loss (9,948) (81,006) $ (53,537)
Ending balance (19,335) (9,387) 71,619
Foreign Currency      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (5,744) 86,236  
OCI before reclassifications (20,455) (91,980)  
Amount reclassified from accumulated OCI 0 0  
Other Comprehensive Loss (20,455) (91,980)  
Ending balance (26,199) (5,744) 86,236
Long-Term Notes      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance 4,111 (6,465)  
OCI before reclassifications 13,261 10,576  
Amount reclassified from accumulated OCI 0 0  
Other Comprehensive Loss 13,261 10,576  
Ending balance 17,372 4,111 (6,465)
Defined Benefit Plans      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (9,757) (7,601)  
OCI before reclassifications (2,284) (2,292)  
Amount reclassified from accumulated OCI 793 136  
Other Comprehensive Loss (1,491) (2,156)  
Ending balance (11,248) (9,757) (7,601)
Derivatives      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance 2,003 (551)  
OCI before reclassifications 989 3,545  
Amount reclassified from accumulated OCI (2,252) (991)  
Other Comprehensive Loss (1,263) 2,554  
Ending balance $ 740 $ 2,003 $ (551)