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Share Based Compensation - Restricted Stock Units (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Restricted stock and performance-based restricted stock units      
Other disclosures      
Unrecognized stock-based compensation expense related to non-vested stock $ 32.7    
Weighted- average period over which unrecognized stock-based compensation cost will be expensed 1 year 4 months 24 days    
Restricted stock units      
Units      
Vested (in units) (600,000) (700,000) (400,000)
Other disclosures      
Intrinsic value of shares fully vested during the period $ 12.3 $ 12.0 $ 5.9
Total estimated grant date fair values $ 12.9 $ 13.3 $ 17.7
Restricted stock units | Employee Awards      
Units      
Nonvested at the beginning of the year (in units) 1,208,628 1,183,039  
Granted (in units) 467,896 569,571  
Vested (in units) (452,306) (422,884)  
Forfeited (in units) (59,994) (121,098)  
Nonvested at the end of the year (in units) 1,164,224 1,208,628 1,183,039
Weighted Average Grant Date Fair Value      
Nonvested at the beginning of the year (in dollars per unit) $ 14.47 $ 14.30  
Granted (in dollars per unit) 19.14 15.70  
Vested (in dollars per unit) 14.48 16.07  
Forfeited (in dollars per unit) 14.94 13.02  
Nonvested at the end of the year (in dollars per unit) $ 16.32 $ 14.47 $ 14.30
Restricted stock units | Director Awards      
Units      
Nonvested at the beginning of the year (in units) 61,376 98,406  
Granted (in units) 55,752 61,376  
Vested (in units) (61,376) (98,406)  
Nonvested at the end of the year (in units) 55,752 61,376 98,406
Weighted Average Grant Date Fair Value      
Nonvested at the beginning of the year (in dollars per unit) $ 18.25 $ 12.66  
Granted (in dollars per unit) 20.09 18.25  
Vested (in dollars per unit) 18.25 12.66  
Nonvested at the end of the year (in dollars per unit) $ 20.10 $ 18.25 $ 12.66
Performance-based stock awards | Employee Awards      
Units      
Nonvested at the beginning of the year (in units) 593,099 702,391  
Granted (in units) 147,983 165,853  
Vested (in units) (120,953) (199,395)  
Forfeited (in units) (20,645) (75,750)  
Nonvested at the end of the year (in units) 599,484 593,099 702,391
Weighted Average Grant Date Fair Value      
Nonvested at the beginning of the year (in dollars per unit) $ 17.63 $ 19.40  
Granted (in dollars per unit) 19.16 15.76  
Vested (in dollars per unit) 18.40 22.16  
Forfeited (in dollars per unit) 18.32 18.06  
Nonvested at the end of the year (in dollars per unit) $ 17.82 $ 17.63 $ 19.40