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Employee Compensation Plans - Summarizes of Company's Non-Vested ESP/EIP Awards (Details) - Restricted Stock - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Number of shares, Non-vested beginning of year 1,257,558  
Granted, Number of shares 408,207  
Vested, Number of shares (377,011)  
Forfeited or expired, Number of shares (65,221)  
Number of shares, Non-vested end of year 1,223,533 1,257,558
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures    
Weighted average fair value, Non-vested beginning of year $ 19.29  
Weighted average fair value, Granted 12.63  
Weighted average fair value, Vested 19.38  
Weighted average fair value, Forfeited or expired 17.99  
Weighted average fair value, Non-vested end of year $ 17.11 $ 19.29
Remaining contractual life, Non-vested 2 years 19 days 1 year 8 months 30 days
Remaining contractual life, Granted 3 years 2 months 24 days