Commitments and Contingencies - Future Minimum Lease Payments (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Operating Leases
Operating leases, 2018	$ 9,954
Operating leases, 2019	6,111
Operating leases, 2020	4,454
Operating leases, 2021	3,024
Operating leases, 2022	2,080
Operating leases, thereafter	749
Operating leases, future lease payments	26,372
Operating leases, future lease payments	(2,618)
Operating leases, amount representing interest	23,754
Operating lease obligations	(8,620)	$ (9,202)
Operating lease obligations, net of current portion	15,134
Finance Leases
Finance leases, 2018	7,636
Finance leases, 2019	3,819
Finance leases, 2020	1,555
Finance leases, 2021	435
Finance leases, 2022	48
Finance leases, thereafter	20
Finance leases, future lease payments	13,513
Finance leases, amount representing interest	(496)
Finance leases, present value of future payments	13,017
Finance lease obligations, current portion	(7,332)	(7,421)
Finance lease obligations, net of current portion	$ 5,685	$ 5,811

Operating Leases, Future Minimum Payments, Interest Included in Payments

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Amount of capital lease obligation due within one year or the normal operating cycle, if longer.

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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 and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.

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Amount of minimum lease payments for capital leases.

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Amount of minimum lease payments for capital leases due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount necessary to reduce net minimum lease payments to present value for capital leases.

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Amount of minimum lease payments for capital leases due in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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