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Stockholders' Equity (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Aug. 16, 2016
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
item
shares
Dec. 31, 2015
shares
Equity offerings      
Common stock, shares outstanding (in shares)   107,231,155 100,187,405
Proceeds from the issuance of common stock, net | $   $ 83,511  
2002 Stock Incentive Plan      
Equity-Based Compensation      
Maximum number of shares provided for grant under equity-based incentive compensation plan   2,000,000  
Number of vesting requirements | item   0  
Number of shares available for grant under the plan   1,944,428  
Public Offering and Over Allotment Option      
Equity offerings      
Shares of common stock sold 7,043,750    
Price per share of common stock sold (in dollars per share) | $ / shares $ 12.35    
Proceeds from the issuance of common stock, net | $ $ 82,900    
Underwriter Overallotment Option      
Equity offerings      
Shares of common stock sold 918,750