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Restructuring Charges (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restructuring accrual and changes                      
Charges $ 1,360 $ 924 $ 1,139 $ 2,910 $ (34) $ 359 $ 1,416 $ 3,205 $ 10,739 $ 6,333 $ 4,946
Accrued liabilities                      
Restructuring accrual and changes                      
Balance at the beginning of the period       54       0 1,221 54 0
Charges                 10,739 6,333 4,946
Payments                 (11,420) (5,166) (4,892)
Other Adjustments                 (42) 0 0
Balance at the end of the period 1,221       54       498 1,221 54
Accrued liabilities | Employment termination costs                      
Restructuring accrual and changes                      
Balance at the beginning of the period       0       0 1,181 0 0
Charges                 10,739 6,333 4,883
Payments                 (11,404) (5,152) (4,883)
Other Adjustments                 (42) 0 0
Balance at the end of the period 1,181       0       474 1,181 0
Accrued liabilities | Facilities consolidation                      
Restructuring accrual and changes                      
Balance at the beginning of the period       $ 54       $ 0 40 54 0
Charges                 0 0 63
Payments                 (16) (14) (9)
Other Adjustments                 0 0 0
Balance at the end of the period $ 40       $ 54       $ 24 $ 40 $ 54