Leases (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Leases [Abstract]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 13,960
Operating Leases, Future Minimum Payments, Due in Two Years	12,870
Operating Leases, Future Minimum Payments, Due in Three Years	12,010
Operating Leases, Future Minimum Payments, Due in Four Years	10,830
Operating Leases, Future Minimum Payments, Due in Five Years	7,430
Operating Leases, Future Minimum Payments, Due Thereafter	19,850
Operating Leases, Future Minimum Payments Due	$ 76,950