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Derivative Financial Instruments - Pre-tax Impact of Terminated Cash Flow Hedges on AOCI (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
AOCI Attributable to Parent, Before Tax [Roll Forward]        
Beginning Balance $ 3,387,045 $ 1,662,734 $ 3,428,052 $ 1,600,153
Unrealized gains on terminated hedges arising during the period 0 30,952 0 30,952
Reclassification adjustments for amortization of unrealized (gains) into net income (8,219) (373) (16,493) (373)
Ending balance 3,430,622 1,693,630 3,430,622 1,693,630
Accumulated Gain (Loss), Net, Terminated Cash Flow Hedge, Parent        
AOCI Attributable to Parent, Before Tax [Roll Forward]        
Beginning Balance 33,199 0 41,473 0
Ending balance $ 24,980 $ 30,579 $ 24,980 $ 30,579