Leases - Operating Lease Minimum Payments (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Operating Lease Liabilities, Payments Due
2019	$ 1,575
2020	4,918
2021	4,296
2022	2,220
2023	1,070
Thereafter	6,294
Total undiscounted rental payments	20,373
Less imputed interest	(3,157)
Total lease liabilities	$ 17,216
Operating Leases Liabilities, Before Adoption
2019		$ 4,921
2020		4,801
2021		4,179
2022		2,103
2023		953
Thereafter		5,054
Total undiscounted rental payments		22,011
Less imputed interest		(3,289)
Total lease liabilities		$ 18,722

Operating Leases, Future Minimum Payments Due, Undiscounted Excess Amount

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Operating Leases, Lease Liability Excluding Imputed Interest

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Amount of lessee's undiscounted obligation for lease payments for operating lease.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due after fifth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fifth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fourth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in second fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease having an initial or remaining lease term in excess of one year due in remainder of fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease.

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