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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Mar. 31, 2017
Jul. 11, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Payments for Repurchase of Common Stock $ 0 $ 14,678          
Weighted Average Exercise Price of Stock Awards $ 21.53 $ 18.36 $ 18.36     $ 20.33  
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 1 month 23 days            
Restricted Stock Shares Authorized             900
Share-based Compensation $ 100 $ 700          
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) 53 102          
Unvested at beginning of year, Weighted Average Grant Date Fair Value (in dollars) $ 21.53 $ 18.36          
Share-based Compensation Arrangements by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 0 33          
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 $ 17.48          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (9) (46)          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 26.12 $ 18.51          
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 $ 0.00 $ 0          
Outstanding (unvested) at end of year, Number of Restricted Stock Awards (in shares) 44 89 102        
Outstanding (unvested) at end of year, Weighted Average Grant Date Fair Value (in dollars) $ 20.33 $ 17.68 $ 18.36