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Share-Based Compensation and Employee Ownership Restricted Stock Units Granted to Employees (Details) - USD ($)
1 Months Ended 12 Months Ended
Jul. 30, 2020
Apr. 30, 2019
Mar. 31, 2016
Dec. 31, 2020
Dec. 31, 2019
Performance based restricted stock | Minimum          
Weighted-Average Grant Date Fair Value          
Percent of RSU's earned       0.00%  
Performance based restricted stock | Maximum          
Weighted-Average Grant Date Fair Value          
Percent of RSU's earned       200.00%  
Equity Plans | Restricted Shares and Restricted Stock Units (RSUs)          
Nonvested Restricted Shares and Restricted Stock Units          
Balance outstanding, beginning of period, shares       5,364,486 5,962,295
Granted, shares       2,709,979 2,435,058
Vested, shares       (2,419,818) (2,291,032)
Canceled, shares       (87,348) (584,333)
Forfeited, shares       (117,108) (157,502)
Balance outstanding, end of period, shares       5,450,191 5,364,486
Weighted-Average Grant Date Fair Value          
Balance outstanding, beginning of period, in dollars per share       $ 16.67 $ 15.73
Granted, in dollars per share       17.40 16.58
Vested, in dollars per share       15.59 15.63
Canceled, in dollars per share       14.80 11.49
Forfeited, in dollars per share       15.62 13.98
Balance outstanding, end of period, in dollars per share       $ 17.56 $ 16.67
Equity Plans | Restricted Stock Units (RSUs) | Non-employee Director          
Weighted-Average Grant Date Fair Value          
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number       259,536 216,912
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period         120,430
Equity Plans | Performance based restricted stock          
Nonvested Restricted Shares and Restricted Stock Units          
Granted, shares 1,366,666 1,366,666 1,366,666    
Vested, shares       (379,319)  
Forfeited, shares       (320,681)  
Equity Plans | Performance based restricted stock | Share-based Payment Arrangement, Tranche Three [Member]          
Nonvested Restricted Shares and Restricted Stock Units          
Vested, shares       (233,333)  
Weighted-Average Grant Date Fair Value          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested       $ 420,000