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Derivative Instruments Derivative Instruments - Changes in AOCI (net of tax) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of the period $ 9,034,790 $ 1,248,599
Other Comprehensive Income (Loss), Net of Tax 19,593 (8,470)
Balance at end of the period 9,118,597 1,925,681
AOCI (net of tax) related to cash flow hedges    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of the period (3,756) (2,778)
Other Comprehensive Income (Loss), Net of Tax 192 (3,160)
Balance at end of the period (2,416) (5,668)
AOCI (net of tax) related to cash flow hedges | Amount reclassified out of Other comprehensive income (loss)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Other Comprehensive Income (Loss), Net of Tax $ 1,148 $ 270