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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Currency Translation Adjustments and Other      
Beginning balance $ (36,087) $ 35,875 $ 57,860
Other current period change 99,933 71,962 21,985
Ending balance (136,020) (36,087) 35,875
Net Actuarial Loss      
Beginning balance (585,941) (477,883) (648,113)
Amortization 19,505 14,866 22,820
Pension lump sum settlement expense   61,333  
Other current period change (10,557) (184,257) 147,410
Ending balance (576,993) (585,941) (477,883)
Prior Service Credit      
Beginning balance 1,758 3,760 2,634
Amortization 1,411 2,676 1,340
Other current period change (69) 674 2,466
Ending balance 278 1,758 3,760
Accumulated Other Comprehensive Loss      
Beginning balance (620,270) (438,248) (587,619)
Amortization 18,094 12,190 21,480
Pension lump sum settlement expense   61,333  
Other current period change (110,559) (255,545) 127,891
Ending balance $ (712,735) $ (620,270) $ (438,248)