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Stock-Based Compensation (Summary of Restricted Stock Transactions) (Details) - shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
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) 1,053,842    
Awarded: (in shares) 958,672 269,025 187,209
Non-vested shares outstanding at end of period (in shares) 2,142,743 1,053,842  
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) 1,515,700    
Released: (in shares) (353,555)    
Forfeitures: (in shares) (63,575)    
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) 150,069    
Released: (in shares) 0    
Forfeitures: (in shares) (159,738)