Subsequent Events Subsequent Events (Details) - USD ($) $ in Thousands	2 Months Ended	12 Months Ended
	Feb. 27, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Subsequent Event [Line Items]
Stock issuance subsequent to period end		$ 43,457	$ 78,532	$ 685
Subsequent Event [Member]
Subsequent Event [Line Items]
Stock issuance subsequent to period end	$ 46,105
Stock Issued During Period, Shares, New Issues	8,050,000