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Intangible Assets and Liabilities Estimated Future Annual Amortization Expense (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Intangible Assets [Abstract]
2019 (amount remaining at September 30, 2019)	$ 18,162
2020	52,850
2021	37,547
2022	27,212
2023	19,678
Beyond 2023	46,872
Total intangible assets subject to amortization (accretion)	202,321	$ 254,483
2019 (amount remaining at September 30, 2019)	(2,058)
2020	(8,028)
2021	(1,963)
2022	(459)
2023	0
Beyond 2023	0
Intangible liabilities, Net	(12,508)	$ (18,683)
2019 (amount remaining at September 30, 2019)	16,104
2020	44,822
2021	35,584
2022	26,753
2023	19,678
Beyond 2023	46,872
Total intangible assets (liabilities), net	$ 189,813

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