Legal Proceedings (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Legal Proceedings
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 836
Operating Leases, Future Minimum Payments, Due in Two Years	703
Operating Leases, Future Minimum Payments, Due in Three Years	687
Operating Leases, Future Minimum Payments, Due in Four Years	707
Operating Leases, Future Minimum Payments, Due in Five Years	719
Capital Lease Obligations, Current	63,600
Loss contingency accrual, at carrying value	$ 42,100	$ 13,500