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Equity - Changes to Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at beginning of period $ 1,295,142 $ 936,576 $ 1,110,899 $ 1,827,231
Total other comprehensive (loss) income (7,817) 8,831 6,144 (62,073)
Balance at End of Period 1,375,823 1,053,464 1,375,823 1,053,464
Available-for-Sale Securities        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at beginning of period 88,251 53,246 76,336 92,452
Other comprehensive (loss) income before reclassifications (2,658) 8,236 19,552 (19,890)
Amounts reclassified from other accumulated comprehensive income (loss) (6,200) (445) (16,495) (11,525)
Total other comprehensive (loss) income (8,858) 7,791 3,057 (31,415)
Balance at End of Period 79,393 61,037 79,393 61,037
Interest Rate Agreements Accounted for as Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at beginning of period (78,511) (82,637) (80,557) (50,939)
Other comprehensive (loss) income before reclassifications 0 0 0 (32,806)
Amounts reclassified from other accumulated comprehensive income (loss) 1,041 1,040 3,087 2,148
Total other comprehensive (loss) income 1,041 1,040 3,087 (30,658)
Balance at End of Period $ (77,470) $ (81,597) $ (77,470) $ (81,597)