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Intangible Assets and Liabilities Estimated Future Annual Amortization Expense (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Intangible Assets [Abstract]
2021 (amount remaining at June 30, 2021)	$ 18,976
2022	27,520
2023	19,908
2024	15,708
2025	14,713
Thereafter	16,847
Total intangible assets subject to amortization (accretion)	113,672
2021 (amount remaining at June 30, 2021)	(981)
2022	(459)
2023	0
2024	0
2025	0
Thereafter	0
Intangible liabilities, Net	(1,440)	$ (2,421)
2021 (amount remaining at June 30, 2021)	17,995
2022	27,061
2023	19,908
2024	15,708
2025	14,713
Thereafter	16,847
Total intangible assets (liabilities), net	$ 112,232

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