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Reclassifications Out Of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Income tax expense (benefit) $ 7,850 $ 10,503
Amounts reclassified from accumulated other comprehensive income, net of tax (91,914) (80,892)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]    
Amounts reclassified from accumulated other comprehensive income before income tax (2,355) (1,824)
Income tax expense (benefit) 606 352
Amounts reclassified from accumulated other comprehensive income, net of tax $ 1,749 $ 1,472