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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended 46 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2015
Sep. 30, 2016
Dec. 14, 2011
Jul. 11, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Payments for Repurchase of Common Stock     $ 14,678 $ 30,858              
Weighted Average Exercise Price of Stock Awards $ 20.55 $ 18.04 $ 18.36 $ 16.78 $ 16.78 $ 16.78   $ 18.13 $ 21.29    
Weighted average fair value price of stock awards lower     17.06   19.93 21.72 $ 13.86        
weighted average fair value price of stock awards upper     $ 18.78   $ 27.29 $ 27.47 $ 18.18        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition               1 year 3 months 16 days      
Restricted Stock Shares Authorized                   400,000 900,000
Stock-based Compensation $ 141 $ 408 $ 1,161 $ 983              
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized                 $ 600    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]                      
Unvested at beginning of year, Number of Restricted Stock Awards (in shares) 66,800 104,600 102,400 183,100 183,100            
Unvested at beginning of year, Weighted Average Grant Date Fair Value (in dollars) $ 20.55 $ 18.04 $ 18.36 $ 16.78 $ 16.78            
Share-based Compensation Arrangements by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 0 11,200 74,000 15,400              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 0.00 $ 19.94 $ 17.27 $ 21.07              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (11,800) (13,200) (121,400) (95,900)              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 17.11 $ 18.97 $ 17.05 $ 16.25              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 0 0 0 0              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 0 $ 0.00 $ 0.00 $ 0.00              
Outstanding (unvested) at end of year, Number of Restricted Stock Awards (in shares) 55,100 102,600 55,100 102,600 102,400 183,100   102,600      
Outstanding (unvested) at end of year, Weighted Average Grant Date Fair Value (in dollars) $ 21.29 $ 18.13 $ 21.29 $ 18.13 $ 18.36 $ 16.78   $ 18.13