Stockholder's Equity (Details 3) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Stockholders' Equity (Details) [Abstract]
Preferred Stock, Shares Outstanding	14,369,965	14,375,000	14,370,060	25,875,000
Preferred stock, shares redeemed	0	(11,500,000)
Preferred stock, shares converted	(95)	0
Preferred stock balance weighted average rate	6.50%	6.50%	6.50%	6.50%
Preferred stock balance redeemed weighted average rate	0.00%	6.50%
Preferred stock balance converted average rate	6.50%	0.00%
Preferred stock redemption charge	$ 0	$ 9,769