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Restructuring (Cash Components) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Restructuring Reserve [Roll Forward]    
Beginning balance $ 4,144  
Ending balance 27,590 $ 4,144
2016 Restructuring    
Restructuring Reserve [Roll Forward]    
Costs incurred in 2016 36,732  
Payments (5,734)  
Facility deferred rent reclassified to restructuring liability 1,326  
Foreign currency translation adjustment (19)  
Ending balance 32,305  
2016 Restructuring | Personnel Related    
Restructuring Reserve [Roll Forward]    
Costs incurred in 2016 21,252  
Payments (2,742)  
Facility deferred rent reclassified to restructuring liability 0  
Foreign currency translation adjustment (30)  
Ending balance 18,480  
2016 Restructuring | Facility Related    
Restructuring Reserve [Roll Forward]    
Costs incurred in 2016 7,165  
Payments (601)  
Facility deferred rent reclassified to restructuring liability 1,326  
Foreign currency translation adjustment (8)  
Ending balance 7,882  
2016 Restructuring | Contract and Other Costs    
Restructuring Reserve [Roll Forward]    
Costs incurred in 2016 8,315  
Payments (2,391)  
Facility deferred rent reclassified to restructuring liability 0  
Foreign currency translation adjustment 19  
Ending balance 5,943  
2014 Restructuring    
Restructuring Reserve [Roll Forward]    
Beginning balance 4,111 14,620
Payments (3,785) (9,406)
Release of excess accrual (325) (473)
Foreign currency translation adjustment (1) (630)
Ending balance 0 4,111
2014 Restructuring | Personnel Related    
Restructuring Reserve [Roll Forward]    
Beginning balance 469 6,341
Payments (143) (4,789)
Release of excess accrual (325) (453)
Foreign currency translation adjustment (1) (630)
Ending balance 0 469
2014 Restructuring | Facility Related    
Restructuring Reserve [Roll Forward]    
Beginning balance 3,428 7,627
Payments (3,428) (4,199)
Release of excess accrual 0 0
Foreign currency translation adjustment 0 0
Ending balance 0 3,428
2014 Restructuring | Contract and Other Costs    
Restructuring Reserve [Roll Forward]    
Beginning balance 214 652
Payments (214) (418)
Release of excess accrual 0 (20)
Foreign currency translation adjustment 0 0
Ending balance 0 214
2011 Restructuring    
Restructuring Reserve [Roll Forward]    
Beginning balance 726 10,606
Payments (381) (8,895)
Release of excess accrual (340) (775)
Foreign currency translation adjustment (5) (210)
Ending balance 0 726
2011 Restructuring | Personnel Related    
Restructuring Reserve [Roll Forward]    
Beginning balance 726 9,782
Payments (381) (8,071)
Release of excess accrual (340) (775)
Foreign currency translation adjustment (5) (210)
Ending balance 0 726
2011 Restructuring | Facility Related    
Restructuring Reserve [Roll Forward]    
Beginning balance 0 313
Payments 0 (313)
Release of excess accrual 0 0
Foreign currency translation adjustment 0 0
Ending balance 0 0
2011 Restructuring | Contract and Other Costs    
Restructuring Reserve [Roll Forward]    
Beginning balance 0 511
Payments 0 (511)
Release of excess accrual 0 0
Foreign currency translation adjustment 0 0
Ending balance $ 0 $ 0