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Commitments, Contingencies and Other Items - Future Minimum Lease Payments Under Existing Operating and Finance Leases (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Operating leases
2019 (remaining)	$ 5,722
2020	5,439
2021	5,052
2022	4,261
2023	1,569
2024	86
After 2024	211
Future minimum lease payments under existing leases	22,340
Finance leases
2019 (remaining)	2,498
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	$ 28,126

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