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Share-based Compensation - Summary of Share-based Compensation Expense (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total continuing operations   $ 64,788 $ 38,809 $ 39,021
Employee Time Options        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total non-cash stock compensation $ 15,000      
Continuing Operations        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total non-cash stock compensation   61,844 35,114 30,942
Deferred compensation arrangement   0 738 4,901
Total continuing operations   61,844 35,852 35,843
Continuing Operations | Employee Time Options        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total non-cash stock compensation   48,601 25,008 20,637
Continuing Operations | Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total non-cash stock compensation   13,243 10,106 10,305
Discontinued Operations        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total continuing operations   $ 2,944 $ 2,957 $ 3,178