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Stock-Based Compensation (Details) - Equity Plan - Restricted Stock Units - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 38 Months Ended 50 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2016
Jun. 30, 2017
Stock-based compensation            
Units granted     259,065   259,065 259,065
Number of vested units 173,650   173,650     173,650
Number of unvested units 85,415   85,415     85,415
Compensation expense recognized $ 200 $ 400 $ 700 $ 700    
Unrecognized compensation expense $ 1,600   $ 1,600     $ 1,600
Period to recognize unrecognized compensation expense     2 years 1 month 6 days      
Accrued dividend equivalent units 2,378   2,378     2,378
2018            
Stock-based compensation            
Number of Units to Vest 28,471   28,471     28,471
2019            
Stock-based compensation            
Number of Units to Vest 51,552   51,552     51,552
2020            
Stock-based compensation            
Number of Units to Vest 5,392   5,392     5,392