Organization and Summary of Significant Accounting Policies (Changes in AOCI) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance, December 31, 2016	$ 3,916,928
Ending balance, June 30, 2017	3,688,686
Gains or (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance, December 31, 2016	(8,899)
Other comprehensive income (loss)	(1,694)
Reclassifications from accumulated other comprehensive income to net earnings	903
Net current period other comprehensive income (loss)	(791)
Ending balance, June 30, 2017	(9,690)
Gains on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance, December 31, 2016	708
Other comprehensive income (loss)	(7)
Reclassifications from accumulated other comprehensive income to net earnings	0
Net current period other comprehensive income (loss)	(7)
Ending balance, June 30, 2017	701
Total
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance, December 31, 2016	(8,191)
Other comprehensive income (loss)	(1,701)
Reclassifications from accumulated other comprehensive income to net earnings	903
Net current period other comprehensive income (loss)	(798)
Ending balance, June 30, 2017	$ (8,989)