Organization and Basis of Presentation Expensed Pursuit Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Expensed Pursuit Costs [Abstract]
Expensed pursuit costs	$ 59	$ 153	$ 383	$ 185