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Stock-Based Compensation - Activity and Pricing Information for Nonvested Shares Granted Under Deferred Compensation Plans and Other Restricted Stock Awards (Details) - Deferred Compensation Plans and Other Restricted Stock Award [Member] - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Number of Nonvested Shares Outstanding, Beginning Balance (in shares) 4,223,774    
Number of Nonvested Shares, Granted (in shares) 724,287    
Number of Nonvested Shares, Dividend Equivalents (in shares) 18    
Number of Nonvested Shares, Vested (in shares) (1,523,387)    
Number of Nonvested Shares, Forfeited (in shares) (144,875)    
Number of Nonvested Shares Outstanding, Ending Balance (in shares) 3,279,817 4,223,774  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Weighted-Average Grant-Date Fair Value Outstanding, Beginning Balance (in dollars per share) $ 15.61    
Weighted-Average Grant Date Fair Value, Granted (in dollars per share) 20.77 $ 18.55 $ 11.46
Weighted-Average Grant Date Fair Value, Dividend Equivalents (in dollars per share) 20.03    
Weighted-Average Grant-Date Fair Value, Vested (in dollars per share) 14.43    
Weighted-Average Grant-Date Fair Value, Forfeited (in dollars per share) 14.18    
Weighted-Average Grant-Date Fair Value Outstanding, Ending Balance (in dollars per share) $ 17.36 $ 15.61