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Equity and Long-Term Incentive Plans (Schedule of Restricted Stock Unit Activity) (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
2011 Non-Employee Director Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Granted, number of shares 54,535 34,678
Released/Vested, number of shares (43,938) (4,566)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Granted, weighted average fair value per stock unit at date of grant (in dollars per share) $ 28.33 $ 54.42
Released/Vested, weighted average fair value per stock unit at date of grant (in dollars per share) $ 51.24 $ 55.90
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested, Number of Shares [Roll Forward]    
Vested award beginning balance, number of shares 249,768 219,656
Vested award ending balance, number of shares 260,365 249,768
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested, Weighted Average Grant Date Fair Value [Abstract]    
Vested award beginning balance, weighted average fair value per stock unit at date of grant (in dollars per share) $ 54.38 $ 54.40
Vested award ending balance, weighted average fair value per stock unit at date of grant (in dollars per share) $ 49.45 $ 54.38
Parent Company [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Unvested award, beginning balance, number of shares 760,431 881,477
Granted, number of shares 824,946 371,673
Released/Vested, number of shares (322,458) (410,865)
Canceled/Forfeited, number of shares (260,382) (81,854)
Unvested award, ending balance, number of shares 1,002,537 760,431
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Unvested award beginning balance, weighted average fair value per stock unit at date of grant (in dollars per share) $ 57.89 $ 57.49
Granted, weighted average fair value per stock unit at date of grant (in dollars per share) 25.78 61.69
Released/Vested, weighted average fair value per stock unit at date of grant (in dollars per share) 61.18 60.74
Canceled/Forfeited, weighted average fair value per stock unit at date of grant (in dollars per share) 48.57 55.85
Unvested award ending balance, weighted average fair value per stock unit at date of grant (in dollars per share) $ 43.79 $ 57.89
Parent Company [Member] | Share-based Compensation Award, Tranche Two [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Unvested award, beginning balance, number of shares 2,369,901 2,384,767
Granted, number of shares 335,472 582,282
Released/Vested, number of shares (858,101) (519,531)
Canceled/Forfeited, number of shares (369,650) (77,617)
Unvested award, ending balance, number of shares 1,477,622 2,369,901