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Stock-Based Compensation (Summary of Restricted Stock Transactions) (Details) - shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Non-vested shares outstanding at beginning of period (in shares) 2,142,743    
Awarded (in shares) 416,695 958,672 269,025
Non-vested shares outstanding at end of period (in shares) 2,102,654 2,142,743  
Time-vesting      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Awarded (in shares) 406,145    
Released (in shares) (387,628)    
Forfeitures (in shares) (132,275)    
Performance-based      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Awarded (in shares) 202,876    
Released (in shares) 0    
Forfeitures (in shares) (129,207)