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Corporate Restructuring Costs (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 19,096 $ 19,096  
Accrual for restructuring costs 16,785 16,785 $ 0
Share-based Compensation Adjustment [1] 6,426 6,426  
Impairment, Closure Costs, and Asset Disposals [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 16,299 16,299  
Minimum [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring and related cost, expected cost 70,000 70,000  
Expected restructuring costs 57,000 57,000  
Maximum [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring and related cost, expected cost 80,000 80,000  
Expected restructuring costs 66,000 66,000  
Employee Severance and Other Transition Costs [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 493 493  
Accrual for restructuring costs 493 493 0
Employee Severance and Other Transition Costs [Member] | Minimum [Member]      
Restructuring Cost and Reserve [Line Items]      
Expected restructuring costs 23,000 23,000  
Employee Severance and Other Transition Costs [Member] | Maximum [Member]      
Restructuring Cost and Reserve [Line Items]      
Expected restructuring costs 26,000 26,000  
Recruitment and Relocation Costs [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 207 207  
Accrual for restructuring costs 0 0 0
Recruitment and Relocation Costs [Member] | Minimum [Member]      
Restructuring Cost and Reserve [Line Items]      
Expected restructuring costs 15,000 15,000  
Recruitment and Relocation Costs [Member] | Maximum [Member]      
Restructuring Cost and Reserve [Line Items]      
Expected restructuring costs 16,000 16,000  
Lease Termination Costs [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 15,196 15,196  
Accrual for restructuring costs 14,697 14,697 0
Lease Termination Costs [Member] | Minimum [Member]      
Restructuring Cost and Reserve [Line Items]      
Expected restructuring costs 9,000 9,000  
Lease Termination Costs [Member] | Maximum [Member]      
Restructuring Cost and Reserve [Line Items]      
Expected restructuring costs 13,000 13,000  
Third-party and Other Costs [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 3,200 3,200  
Expected restructuring costs 1,000 1,000  
Accrual for restructuring costs 1,595 1,595 $ 0
Non-cash Impairment [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 1,103 1,103  
Employee Severance and Other Transition Costs, Recruitment and Relocation Costs, and Third-party and Other Costs [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 3,900 3,900  
Share-based Compensation Costs [Member] | Minimum [Member]      
Restructuring Cost and Reserve [Line Items]      
Expected restructuring costs 9,000 9,000  
Share-based Compensation Costs [Member] | Maximum [Member]      
Restructuring Cost and Reserve [Line Items]      
Expected restructuring costs $ 10,000 $ 10,000  
[1] Cumulative adjustment to reduce stock-based compensation expense as we reduced our estimate of the number of certain awards that we expect will vest. See Note 9. "Stock-based Compensation" below for discussion of stock-based compensation expense related to the restructuring.