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Stockholders' Equity (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
May. 15, 2013
USD ($)
$ / shares
shares
Dec. 31, 2015
item
shares
Dec. 31, 2013
USD ($)
Dec. 31, 2014
shares
Stockholders' Equity        
Common stock, shares outstanding (in shares)   100,187,405   100,187,405
Equity offerings        
Proceeds from the issuance of common stock, net | $     $ 241,500  
Offering related expenses incurred | $     $ 10,818  
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    
May 2013 Public Offering and Underwriter Overallotment Option        
Equity offerings        
Shares of common stock sold 17,250,000      
Price per share of common stock sold (in dollars per share) | $ / shares $ 14.00      
May 2013 Underwriter Overallotment Option        
Equity offerings        
Shares of common stock sold 2,250,000      
May 2013 Public Offering        
Equity offerings        
Proceeds from the issuance of common stock, net | $ $ 230,700      
Offering related expenses incurred | $ $ 10,800