Commitments and Contingencies (Future Minimum Payments, Operating and Capital Leases) (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Capital Leases
2018	$ 1,150
2019	619
2020	75
2021	0
2022	0
Thereafter	0
Total minimum lease payments	1,844
Less amount representing interest	(228)
Present value of capital lease obligations	1,616
Less current portion of capital lease obligations	(1,092)
Long-term capital lease obligations	524
Operating Leases
2018	3,103
2019	3,260
2020	1,969
2021	765
2022	8
Thereafter	0
Total minimum lease payments	9,105
Purchase Commitments
2018	3,238
2019	0
2020	0
2021	0
2022	0
Thereafter	0
Total minimum lease payments	$ 3,238