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Stock-Based Compensation (Summary of Restricted Stock Transactions) (Details) - shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
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) 1,778,275    
Awarded: (in shares) 187,209 375,575 60,933
Non-vested shares outstanding at end of period (in shares) 1,321,292 1,778,275  
Time-vesting [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Awarded: (in shares) 127,167    
Released: (in shares) (414,389)    
Forfeitures: (in shares) (55,717)    
Performance-based [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Awarded: (in shares) 137,374    
Released: (in shares) (90,003)    
Forfeitures: (in shares) (161,415)