Stockholders' Equity - Preferred Stock (Details) - $ / shares |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Stockholders' equity | ||
| Preferred Stock, Shares Authorized | 5,000,000 | |
| Preferred Stock, Par or Stated Value Per Share | $ 0.01 | |
| Series A Junior Participating Cumulative Preferred Stock | ||
| Stockholders' equity | ||
| Preferred Stock, Par or Stated Value Per Share | $ 0.01 | $ 0.01 |
| Shares, Outstanding | 0 | 0 |