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Commitments, Contingencies and Other Items - Future Minimum Lease Payments Under Existing Operating and Finance Leases (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Operating leases
2019 (remaining)	$ 2,256
2020	6,625
2021	6,397
2022	5,681
2023	2,690
2024	1,301
After 2024	923
Future minimum lease payments under existing leases	25,873
Finance leases
2019 (remaining)	833
2020	3,336
2021	3,336
2022	3,336
2023	2,830
2024	2,661
After 2024	10,129
Future minimum lease payments under existing leases	$ 26,461

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