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Legal Proceedings (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Legal Proceedings |  |
Operating Leases, Future Minimum Payments Due, Next Twelve Months | $ 882 |
Operating Leases, Future Minimum Payments, Due in Two Years | 724 |
Operating Leases, Future Minimum Payments, Due in Three Years | 708 |
Operating Leases, Future Minimum Payments, Due in Four Years | 718 |
Operating Leases, Future Minimum Payments, Due in Five Years | 733 |
Operating Leases, Future Minimum Payments, Due Thereafter | 62,788 |
Loss contingency accrual, at carrying value | 32,100 | $ 42,100
Operating Leases, Future Minimum Payments Due | $ 66,553 |

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