Commitments and Contingencies Lease Commitments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Operating Leases, Future Minimum Payments Due, Less than 1 year	$ 481
Operating Leases, Future Minimum Payments, 1 year to 3 years	553
Operating Leases, Future Minimum Payments, 3 years to 5 years	221
Operating Leases, Future Minimum Payments, More than 5 years	0
Operating Leases, Future Minimum Payments Due	1,255
Operating Leases, Rent Expense, Net	$ 600	$ 600	$ 600