Accumulated Other Comprehensive Income (Schedule of Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of revenue	$ 258,250		$ 262,250		$ 524,996	$ 506,709
Tax expense	34,826		30,421		59,743	52,504
Gain, net of tax	148,996	$ 111,856	125,701	$ 102,709	260,852	228,410
Accumulated Net Gain (Loss) from Cash Flow Hedges | Amount of (Loss) Gain Reclassified from Accumulated Other Comprehensive Income into Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of revenue	1,812		2,509		3,153	3,920
Tax expense	339		358		579	607
Gain, net of tax	$ 1,473		$ 2,151		$ 2,574	$ 3,313