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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended 52 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2011
Mar. 31, 2016
Mar. 31, 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 $ 18.36 $ 16.78 $ 16.78 $ 16.78     $ 17.68 $ 17.68 $ 13.57  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period           351,000 477,000      
Restricted Stock Shares Authorized                   900,000
Stock-based Compensation $ 587 $ 287                
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized               $ 400    
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) 102,400 183,100 183,100              
Unvested at beginning of year, Weighted Average Grant Date Fair Value (in dollars) $ 18.36 $ 16.78 $ 16.78              
Share-based Compensation Arrangements by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 33,000 2,000                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 17.48 $ 27.29                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (46,400) (10,000)                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 18.51 $ 13.57                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 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                
Outstanding (unvested) at end of year, Number of Restricted Stock Awards (in shares) 89,000 175,100 102,400 183,100     89,000      
Outstanding (unvested) at end of year, Weighted Average Grant Date Fair Value (in dollars) $ 17.68 $ 16.49 $ 18.36 $ 16.78     $ 17.68      
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   27.47 27.29            
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