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Commitments and Contingencies (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Legal Proceedings |  |
Operating Leases, Future Minimum Payments Due, Next Twelve Months | $ 2,729 |
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 |
Loss Contingency Accrual | 8,700 | $ 32,100
Operating Leases, Future Minimum Payments Due | 82,288 |
Cleven Litigation Case [Member] |  |
Legal Proceedings |  |
Loss Contingency, Estimate of Possible Loss | 54,600 |
Brown Litigation Case [Member] |  |
Legal Proceedings |  |
Loss Contingency, Estimate of Possible Loss | $ 8,400 |

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