Intangible Assets and Liabilities Estimated Future Annual Amortization Expense (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Intangible Assets [Abstract]
2020 (amount remaining at September 30, 2020)	$ 13,252
2021	37,757
2022	27,368
2023	19,778
2024	15,605
Thereafter	31,128
Total intangible assets subject to amortization (accretion)	144,888
2020 (amount remaining at September 30, 2020)	(2,006)
2021	(1,963)
2022	459
2023	0
2024	0
Thereafter	0
Intangible liabilities, Net	(4,428)	$ (10,450)
2020 (amount remaining at September 30, 2020)	11,246
2021	35,794
2022	26,909
2023	19,778
2024	15,605
Thereafter	31,128
Total intangible assets (liabilities), net	$ 140,460