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Stock-Based Compensation - Vesting and Deferred Compensation Plan (Details) - shares
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Restricted stock awards    
Stock-based compensation    
Vesting period of shares awarded under the Program 3 years  
Performance share awards    
Stock-based compensation    
Vesting period of shares awarded under the Program 3 years  
Deferred Compensation Equity    
Performance share awards    
Number of common stock deferred (in shares) 274,800 253,520