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