Commitments and Contingencies (Future Minimum Lease Commitments) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Operating and Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] [Abstract]
Sublease income netted with future minimum lease commitments	$ 1,000
2019	6,416
2020	6,615
2021	6,481
2022	6,153
2023	5,342
Thereafter	17,511
Total	$ 48,518