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Share-Based Compensation and Employee Ownership Plans SARs (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term   0 years  
Stock Appreciation Rights      
Weighted Average Exercise Price/Share      
Exercisable, weighted remaining contractual term 0 0  
Equity Plans      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 0 $ 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period 0 0  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price $ 0 $ 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 0 $ 0 $ 0
Share-based Compensation Arrangements by Share-based Payment Award, Options, Other Share Increase (Decrease) in Period, Weighted Average Exercise Price $ 0 $ 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 0 0  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 0 $ 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 0 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 0 0 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 0 years 0 years  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 0 $ 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 0 years    
Weighted Average Exercise Price/Share      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value $ 0 $ 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 0 0  
Equity Plans | Restricted Shares and Restricted Stock Units (RSUs)      
Shares Subject to Option      
Balance outstanding, beginning of period, shares 5,962,295 5,579,293  
Acquired, shares (2,291,032) (1,961,824)  
Balance outstanding, end of period, shares 5,364,486 5,962,295 5,579,293
Weighted Average Exercise Price/Share      
Balance outstanding, beginning of period, in dollars per share $ 15.73 $ 16.33  
Acquired, in dollars per share 15.63 15.60  
Balance outstanding, end of period, in dollars per share $ 16.67 $ 15.73 $ 16.33
Granted, shares 2,435,058 2,413,727  
Granted, in dollars per share $ 16.58 $ 14.20  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 157,502 68,901  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 13.98 $ 14.21  
Equity Plans | Stock Appreciation Rights      
Shares Subject to Option      
Balance outstanding, beginning of period, shares 0 75,000  
Acquired, shares   (75,000)  
Balance outstanding, end of period, shares 0 0 75,000
Balance exercisable, shares 0 0  
Weighted Average Exercise Price/Share      
Balance outstanding, beginning of period, in dollars per share   $ 11.60  
Acquired, in dollars per share   $ 14.21  
Balance outstanding, end of period, in dollars per share     $ 11.60
Weighted Average Remaining Term Outstanding 0 years 0 years 2 months 15 days
Aggregate intrinsic value, outstanding $ 0 $ 0 $ 173
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercisable, Weighted Average Grant Date Fair Value $ 0 $ 0