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Shareholders' (Deficit) Equity (Narrative) (Details) - USD ($)
$ in Thousands, shares in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation related to share-based awards $ 24,733 $ 17,890
Share-based compensation awards 88,400  
Additional Paid-in Capital    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation related to share-based awards $ 24,733 $ 17,890
Nonvested Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Service period 1 year 6 months  
Nonvested Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Service period 2 years 2 months 12 days  
Plan | Performance Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Target amount of share-based compensation awards (in shares) 0.2