Leases - Future Minimum Rental Commitments Under Finance and Operating Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Leases [Abstract]
Finance leases, 2020 (excluding the six months ended June 30, 2020)	$ 1,740
Finance leases, 2021	1,617
Finance leases, 2022	1,350
Finance leases, 2023	549
Finance leases, 2024	582
Thereafter	4,161
Finance leases, total minimum lease payments	9,999
Finance leases, imputed interest	(1,383)
Finance lease liabilities	8,616	$ 9,520
Operating leases, 2020 (excluding the six months ended June 30, 2020)	4,890
Operating leases, 2021	4,355
Operating leases, 2022	4,139
Operating leases, 2023	4,102
Operating leases, 2024	3,994
Thereafter	14,738
Operating leases, total minimum lease payments	36,218
Operating leases, imputed interest	(5,142)
Operating lease liabilities	$ 31,076	$ 32,354