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Commitments and Contingencies - Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Commitments and Contingencies
Capital lease obligations	$ 7,600	$ 7,600
Amortization	4,900	3,800
Capital lease obligations, current	1,085	1,200
Capital lease obligations, noncurrent	2,114	3,200
Rent expense for operating leases	4,400	3,600	$ 4,000
Commitments for future minimum lease payments on noncancelable leases
2019	3,773
2020	1,563
2021	854
2022	569
2023	509
Thereafter	642
Total minimum lease payments	7,910
Less: Amount representing minimum operating lease payments	(3,938)
Total minimum capital lease payments	3,972
Less: Amount representing estimated taxes, maintenance and insurance costs included in total amounts above	(652)
Net minimum capital lease payments	3,320
Less: Amount representing interest	(121)
Present value of net minimum lease payments	3,199
Less: Current maturities of capital lease obligations	(1,085)	(1,200)
Long-term capital lease obligations	$ 2,114	$ 3,200

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- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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