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Stockholders' Equity - Discussion of Warrants (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
May 20, 2015
Jun. 30, 2016
Jun. 30, 2015
Class of Warrant or Right [Line Items]      
Redemption of common stock warrant   $ 0 $ 1,150
Dividend declared (in dollars per share)   $ 0.11 $ 0.11
Common Stock      
Class of Warrant or Right [Line Items]      
Potential repurchase   350,767  
Redemption of common stock warrant $ 1,200    
Maximum number of shares callable by warrants   19,552