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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 |  |  |

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