Commitments and Contingencies - Future Minimum Lease Payments (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Operating Leases
Operating leases, 2018	$ 9,914
Operating leases, 2019	6,734
Operating leases, 2020	4,916
Operating leases, 2021	3,424
Operating leases, 2022	2,482
Operating leases, thereafter	1,361
Operating leases, future lease payments	28,831
Operating leases, future lease payments	(2,112)
Operating leases, amount representing interest	26,719
Operating lease obligations	(9,056)	$ (9,202)
Operating lease obligations, net of current portion	17,663
Finance Leases
Finance leases, 2018	6,989
Finance leases, 2019	3,750
Finance leases, 2020	560
Finance leases, 2021	210
Finance leases, 2022	42
Finance leases, thereafter	13
Finance leases, future lease payments	11,564
Finance leases, amount representing interest	(389)
Finance leases, present value of future payments	11,175
Finance lease obligations, current portion	(6,737)	(7,421)
Finance lease obligations, net of current portion	$ 4,438	$ 5,811

Operating Leases, Future Minimum Payments, Interest Included in Payments

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Operating Leases, Future Minimum Payments, Present Value of Net Minimum 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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Present value of minimum lease payments for capital leases net of executory costs, including amounts paid by the lessee to the lessor for insurance, maintenance and taxes.

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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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Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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