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Stockholders' Equity - Share Repurchase Program (Details) - USD ($)
$ / shares in Units, shares in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Equity [Abstract]    
Holding period of shares required for repurchase 1 year  
Shares repurchased during period (in shares) 2.1 1.8
Value of shares repurchased during period $ 19,200,000 $ 16,100,000
Average price per share (in dollars per share) $ 9.21 $ 9.15
Unfulfilled repurchase requests $ 0