Commitments and Contingencies (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Loss Contingencies [Line Items]
Loss Contingency Accrual	$ 8,800	$ 8,700
Operating Leases, Future Minimum Payments Due, Next Twelve Months	2,054
Operating Leases, Future Minimum Payments, Due in Two Years	2,744
Operating Leases, Future Minimum Payments, Due in Three Years	2,771
Operating Leases, Future Minimum Payments, Due in Four Years	2,767
Operating Leases, Future Minimum Payments, Due in Five Years	2,761
Operating Leases, Future Minimum Payments, Due Thereafter	68,516
Operating Leases, Future Minimum Payments Due	81,613
Net present value adjustment	(48,056)
Operating Lease, Liability	33,557
Cleven Litigation Case [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss	54,600
Brown Litigation Case [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 8,400