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Stockholders' Equity (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Feb. 16, 2017 | Jan. 02, 2015
Stockholders Equity [Line Items] |  |  |  |  |
Dividends declared, per share |  |  | $ 0.50 |  |
Common stock dividends declared, quarterly |  |  | $ 0.125 |  |
Payments of Dividends | $ 0 | $ 0 | $ 25,434,000 |  |
Beneficial Ownership Percentage Limit | 4.90% |  |  | 60.00% |
Preferred stock, par value $0.001 per share; 10,000,000 shares authorized; no shares issued or outstanding | $ 0 | $ 0 |  |  |
Share Price |  |  | $ 4.29 |  | $ 16.72
Share Repurchase Program [Domain] |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |
Preferred stock, par value $0.001 per share; 10,000,000 shares authorized; no shares issued or outstanding | $ 0.001 |  |  |  |
Share Price | $ 15.00 |  |  |  |

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