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Corporate Restructuring Costs (Schedule of Restructuring Costs) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Restructuring Cost and Reserve [Line Items]    
Restructuring charges $ 19,096 $ 19,096
Stock-based compensation [1] (6,426) (6,426)
Total restructuring costs 13,773 13,773
Employee Severance and Other Transition Costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges 493 493
Recruitment and Relocation Costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges 207 207
Lease Termination Costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges 15,196 15,196
Third-party and Other Costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges 3,200 3,200
Non-cash Impairment [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges $ 1,103 $ 1,103
[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.