Discontinued Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2014
Discontinued Operations
After-tax loss from discontinued operations		$ (15)
Interest expense allocated to discontinued operations	$ 0
Revenue and pre-tax income (loss) related to discontinued operations
Revenue		7
Pre-tax loss		(25)
Operation located in Delaware | Maximum
Discontinued Operations
After-tax loss from discontinued operations		$ (100)