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Restructuring Charges - Rollforward (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restructuring accruals rollforward      
Balance at the beginning of the period $ 1,796 $ 824 $ 1,428
Provision 9,971 5,642 4,679
Changes in estimate   (2)  
Payments (10,247) (4,668) (5,283)
Balance at the end of the period 1,520 1,796 824
Non-cash charges related to share based compensation 24,396 15,741 17,986
Restructuring      
Restructuring accruals rollforward      
Non-cash charges related to share based compensation 1,900    
Personnel Severance and Related Costs      
Restructuring accruals rollforward      
Balance at the beginning of the period 1,796 824 1,428
Provision 4,714 4,544 3,513
Changes in estimate   (2)  
Payments (4,990) (3,570) (4,117)
Balance at the end of the period 1,520 1,796 824
Facility Closing Costs      
Restructuring accruals rollforward      
Provision 5,257 1,098 1,166
Payments $ (5,257) $ (1,098) $ (1,166)