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Employee Termination Benefits (Details) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Employee Termination Benefits    
Cash $ 18,637  
Share-Based Compensation $ 12,950  
Number of Shares 763  
Total $ 31,587 $ 400
Employee termination benefits payable 9,900  
Executive Employee Termination Benefits    
Employee Termination Benefits    
Cash 11,945  
Share-Based Compensation $ 9,114  
Number of Shares 554  
Total $ 21,059  
Other Employee Termination Benefits    
Employee Termination Benefits    
Cash 6,692  
Share-Based Compensation $ 3,836  
Number of Shares 209  
Total $ 10,528