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Share Based Compensation - Stock Options Activity (Details) - Stock Options - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 6 years 0 years 4 years 1 month 6 days
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate 3.90% 0.00% 5.70%
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options $ 800 $ 600 $ 200
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value $ 1,100 $ 200 $ 100
Number of Shares [Roll Forward]      
Options exercisable at December 31, 2015 (shares) 1,028    
Options outstanding at December 31, 2015 (shares) 1,259    
Options granted (shares) 125    
Options forfeited (shares) (5)    
Options expired (shares) (1)    
Options exercised (shares) (396)    
Options outstanding at December 31, 2016 (shares) 982 1,028  
Options exercisable at December 31, 2016 (shares) 804 1,259  
Weighted Average Exercise Price per Share [Roll Forward]      
Options exercisable at December 31, 2015 - Weighted Average Exercise Price per Share (US$ per share) $ 2.42    
Options outstanding at December 31, 2015 - Weighted Average Exercise Price per Share (US$ per share) 2.50    
Options granted - Weighted Average Exercise Price per Share (US$ pre share) 5.12    
Options forfeited - Weighted Average Exercise Price per Share (US$ per share) 2.06    
Options expired - Weighted Average Exercise Price per Share (US$ per share) 1.21    
Options exercised - Weighted Average Exercise Price per Share (US$ per share) 2.07    
Options outstanding at December 31, 2016 - Weighted Average Exercise Price per Share (US$ per share) 3.01 $ 2.42  
Options exercisable at December 31, 2016 - Weighted Average Exercise Price per Share (US$ per share) $ 2.69 $ 2.50  
Options outstanding - Weighted Average Remaining Contractual Term (in years) 4 years 2 months 23 days    
Options exercisable - Weighted Average Remaining Contractual Term (in years) 3 years 6 months 4 days    
Options outstanding at December 31, 2016 - Aggregate Intrinsic Value $ 1,970    
Options exercisable at December 31, 2016 - Aggregate Intrinsic Value $ 1,856