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Restructuring Charges - Rollforward (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Restructuring accruals rollforward      
Balance at the beginning of the period $ 824 $ 1,428 $ 533
Provision 5,642 4,679 4,394
Changes in estimate (2)    
Payments (4,668) (5,283) (3,499)
Balance at the end of the period 1,796 824 1,428
Personnel severance and related costs      
Restructuring accruals rollforward      
Balance at the beginning of the period 824 1,428 533
Provision 4,544 3,513 4,012
Changes in estimate (2)    
Payments (3,570) (4,117) (3,117)
Balance at the end of the period 1,796 824 1,428
Facility closing costs      
Restructuring accruals rollforward      
Provision 1,098 1,166 382
Payments $ (1,098) $ (1,166) $ (382)