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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Equity [Abstract]    
Defined benefit pension and other post retirement benefit plans $ (103,520) $ (105,036)
Unrealized loss on foreign currency forward contracts, interest rate swaps, and available-for-sale securities (7,973) (15,499)
Unrealized foreign currency translation gain (3,145) (2,264)
Total accumulated other comprehensive loss, net of tax $ (114,638) $ (122,799)