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Stock-Based Compensation (Summary of Restricted Stock Transactions) (Details)
3 Months Ended
Mar. 31, 2020
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Nonvested stock awards outstanding at beginning of period (in shares) 2,102,654
Nonvested stock awards outstanding at end of period (in shares) 2,039,319
Time-vesting shares  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Awarded (in shares) 68,824
Released (in shares) (82,427)
Forfeitures (in shares) (47,700)
Performance-based shares  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Awarded (in shares) 161,426
Released (in shares) (163,458)
Forfeitures (in shares) 0