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Equity - Changes to Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period $ 1,110,899 $ 1,827,231
Total other comprehensive income (loss) 9,209 (127,044)
Balance at End of Period 1,215,575 725,202
Available-for-Sale Securities    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period 76,336 92,452
Other comprehensive income (loss) before reclassifications 10,986 (80,519)
Amounts reclassified from other accumulated comprehensive income (loss) (2,795) (13,798)
Total other comprehensive income (loss) 8,191 (94,317)
Balance at End of Period 84,527 (1,865)
Interest Rate Agreements Accounted for as Cash Flow Hedges    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period (80,557) (50,939)
Other comprehensive income (loss) before reclassifications 0 (32,806)
Amounts reclassified from other accumulated comprehensive income (loss) 1,018 79
Total other comprehensive income (loss) 1,018 (32,727)
Balance at End of Period $ (79,539) $ (83,666)