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Organization and Summary of Significant Accounting Policies (Other Comprehensive Income (Loss)) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ 3,916,928,000 $ 3,342,393,000
Other comprehensive income (loss) (7,479,000) 13,631,000
Reclassifications from accumulated other comprehensive income to net earnings 1,932,000 (1,470,000)
Net current period other comprehensive income (loss) (5,547,000) 12,161,000
Ending balance 3,840,910,000 3,916,928,000
Gain or Loss on Cash Flow Hedges    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (8,899,000) (25,046,000)
Other comprehensive income (loss) (7,688,000) 13,345,000
Reclassifications from accumulated other comprehensive income to net earnings 1,932,000 2,802,000
Net current period other comprehensive income (loss) (5,756,000) 16,147,000
Ending balance (14,655,000) (8,899,000)
Income tax expense (benefit) 0 0
Gains and Losses on Commercial Mortgage Residual Interests    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 0 4,454,000
Other comprehensive income (loss) 0 (182,000)
Reclassifications from accumulated other comprehensive income to net earnings 0 (4,272,000)
Net current period other comprehensive income (loss) 0 (4,454,000)
Ending balance 0 0
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 708,000 240,000
Other comprehensive income (loss) 209,000 468,000
Reclassifications from accumulated other comprehensive income to net earnings 0 0
Net current period other comprehensive income (loss) 209,000 468,000
Ending balance 917,000 708,000
Total    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (8,191,000) (20,352,000)
Ending balance $ (13,738,000) $ (8,191,000)