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Acquisition, Restructuring and Other Expense (Restructuring Accrual) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Restructuring accrual    
Restructuring accrual, beginning balance $ 7,175 $ 8,254
Expenses incurred 4,735 12,327
Payments made (9,755) (12,897)
Restructuring accrual, ending balance $ 2,155 $ 7,684