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Restructuring and Other Expense (Restructuring Accrual) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Restructuring accrual      
Restructuring accrual, beginning balance $ 8,254 $ 3,128 $ 4,123
Expenses incurred 21,671 21,512 17,376
Payments made (22,750) (16,386) (18,371)
Restructuring accrual, ending balance $ 7,175 $ 8,254 $ 3,128