Organization and Summary of Significant Accounting Policies (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 4,331,682,000	$ 4,154,605,000
Other comprehensive income (loss)	(7,617,000)	(5,408,000)
Reclassifications from accumulated other comprehensive income to net earnings	2,300,000	(24,000)
Net current period other comprehensive income (loss)	(5,317,000)	(5,432,000)
Ending balance	4,319,304,000	4,331,682,000
Gain or Loss on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(11,128,000)	(6,911,000)
Other comprehensive income (loss)	(7,617,000)	(5,524,000)
Reclassifications from accumulated other comprehensive income to net earnings	2,300,000	1,307,000
Net current period other comprehensive income (loss)	(5,317,000)	(4,217,000)
Ending balance	(16,445,000)	(11,128,000)
Income tax expense (benefit)	0	0
Gains and Losses on Available-for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	0	1,215,000
Other comprehensive income (loss)	0	116,000
Reclassifications from accumulated other comprehensive income to net earnings	0	(1,331,000)
Net current period other comprehensive income (loss)	0	(1,215,000)
Ending balance	0	0
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(11,128,000)	(5,696,000)
Ending balance	$ (16,445,000)	$ (11,128,000)