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Acquisition, Restructuring and Other Expense (Restructuring Accrual) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Restructuring accrual    
Restructuring accrual, beginning balance $ 7,175 $ 8,254
Expenses incurred 3,655 8,509
Payments made (6,955) (7,885)
Restructuring accrual, ending balance $ 3,875 $ 8,878