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Stockholders' Equity Stockholders Equity (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Treasury Stock, Shares, Acquired | 1,190,420 |
Treasury Stock Acquired, Average Cost Per Share | $ 3.89 |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 15,366,000 |
Stock Repurchase Program Expiration Date | Feb. 28, 2019 |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased | 20,000,000 |
Beneficial Ownership Percentage Limit | 5.00% |
Fair Value of Profits Interest | $ 591 | $ 591
Preferred Stock, Par or Stated Value Per Share | $ 0.001 |
Preferred Stock, Redemption Price Per Share | $ 12.00 |

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