Commitments and Contingencies (Operating Lease Payments) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Operating Leased Assets [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months		$ 16,674
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2017	$ 18,464
2018	14,096
2019	11,015
2020	5,212
2021	3,081
2022 and beyond	1,574
Total minimum lease payments	49,189	54,855
Lessee, Operating Lease, Liability, Payments, Due	53,442
lessee, operating lease, interest due	(4,253)
Operating Leases, Future Minimum Payments Due, Next Twelve Months	16,558	0
Operating Lease, Liability, Noncurrent	$ 32,631	0
Operating Leases, Future Minimum Payments, Due in Two Years		14,586
Operating Leases, Future Minimum Payments, Due in Three Years		11,875
Operating Leases, Future Minimum Payments, Due in Four Years		5,906
Operating Leases, Future Minimum Payments, Due in Five Years		3,813
Operating Leases, Future Minimum Payments, Due Thereafter		$ 2,001