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Commitments and Contingencies Commitments and Contingencies (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2016	$ 3,700
2017	3,200
2018	2,700
2019	500
2020	300
Thereafter	1,100
Total future minimum lease payments	11,500
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2016	900
2017	800
2018	800
2019	800
2020	900
Thereafter	7,100
Total future minimum lease payments	11,300
Less: amount representing interest (rates ranging from 7.0% to 11.5%)	(4,900)
Less: current portion of obligations under capital leases	(312)	$ (324)
Long-term obligations under capital leases	$ 6,143	$ 6,361
Capital Lease Obligations | Minimum
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Debt instrument interest rate (in percent)	7.00%
Capital Lease Obligations | Maximum
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Debt instrument interest rate (in percent)	11.50%

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