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