Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Intangible assets:
Acquired lease intangibles	$ 1,306,152	$ 1,502,955
Goodwill	1,051,161	1,050,548
Accumulated amortization	(920,742)	(921,107)
Net intangible assets	$ 1,472,408	$ 1,668,155
Remaining weighted average amortization period in years	10 years 2 months 12 days	22 years 10 months 24 days
Intangible liabilities:
Below market lease intangibles	$ 349,357	$ 356,771
Other lease intangibles	13,498	31,418
Accumulated amortization	(203,834)	(191,909)
Purchase option intangibles	3,568	3,568
Net intangible liabilities	$ 162,589	$ 199,848
Below market leases, remaining weighted average amortization period	14 years 6 months	14 years 4 months 24 days
Other lease intangibles, remaining weighted average amortization period		46 years 6 months
Net intangible liabilities, remaining weighted average amortization period	14 years 6 months	17 years 2 months 12 days
Intangibles
Net amortization expense	$ 59,200	$ 49,200	$ 67,200
Estimated net amortization of the intangibles during 2020	53,988
Estimated net amortization of the intangibles during 2021	46,651
Estimated net amortization of the intangibles during 2022	39,315
Estimated net amortization of the intangibles during 2023	36,107
Estimated net amortization of the intangibles during 2024	28,622
Above Market Lease Intangibles
Intangible assets:
Acquired lease intangibles	$ 145,891	$ 181,393
Remaining weighted average amortization period in years	6 years 10 months 24 days	6 years 8 months 12 days
In-Place and Other Lease Intangibles
Intangible assets:
Acquired lease intangibles	$ 1,160,261	$ 1,321,562
Remaining weighted average amortization period in years	10 years 7 months 6 days	24 years 8 months 12 days
Other Intangibles
Intangible assets:
Other finite-lived intangible assets	$ 35,837	$ 35,759
Remaining weighted average amortization period in years	10 years 10 months 24 days	11 years 9 months 18 days