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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended 40 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2011
Mar. 31, 2015
Jun. 30, 2016
Dec. 14, 2011
Jul. 11, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Weighted Average Exercise Price of Stock Awards $ 17.68 $ 16.49 $ 18.36 $ 16.78 $ 16.78 $ 16.78     $ 16.49 $ 20.55 $ 13.57  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition                 1 year 4 months 7 days      
Restricted Stock Shares Authorized                       900,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     518,000         351,000        
Stock-based Compensation $ 310 $ 292 $ 1,020 $ 575                
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized                   $ 800    
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) 89,000 175,100 102,400 183,100 183,100              
Unvested at beginning of year, Weighted Average Grant Date Fair Value (in dollars) $ 17.68 $ 16.49 $ 18.36 $ 16.78 $ 16.78              
Share-based Compensation Arrangements by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 41,000 2,200 74,000 4,200                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 17.11 $ 21.19 $ 17.27 $ 24.06                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (63,200) (72,700) (109,600) (82,700)                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 14 $ 14.30 $ 16 $ 15.73                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 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 $ 0                
Outstanding (unvested) at end of year, Number of Restricted Stock Awards (in shares) 66,800 104,600 66,800 104,600 102,400 183,100     175,100      
Outstanding (unvested) at end of year, Weighted Average Grant Date Fair Value (in dollars) $ 20.55 $ 18.04 $ 20.55 $ 18.04 $ 18.36 $ 16.78     $ 16.49      
Minimum [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Weighted average fair value price of stock awards lower     17.06   19.93 21.72 $ 13.86          
Maximum [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Weighted average fair value price of stock awards lower         18.18              
weighted average fair value price of stock awards upper     $ 18.78   $ 27.29 $ 27.47