Derivatives (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Stockholders' equity	$ (3,901,663,000)	$ (4,319,304,000)	$ (4,331,682,000)	$ (4,154,605,000)
Gain (loss) reclassification to interest expense	3,073,000	2,300,000	1,307,000
Interest rate cash flow hedge gain (loss) to be reclassified over next 12 months, net	2,373,000,000
AOCI, cash flow hedges
Derivative [Line Items]
Stockholders' equity	14,956,000	16,445,000	11,128,000
Accumulated Other Comprehensive Income (Loss)
Derivative [Line Items]
Stockholders' equity	14,956,000	16,445,000	11,128,000	$ 5,696,000
Gain (loss) reclassification to interest expense	$ 3,073,000	$ 2,300,000	$ 1,307,000