Schedule of VIEs (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Total Assets	$ 23,929,404	$ 24,692,208
Total Liabilities	13,415,723	13,873,078
NHP/PMB L.P. | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	649,128	666,404
Total Liabilities	238,168	244,934
Other identified VIEs | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	4,095,102	4,075,821
Total Liabilities	1,653,036	1,459,830
Tax credit VIEs | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	614,490	845,229
Total Liabilities	$ 204,746	$ 333,809