Accumulated Other Comprehensive Income (Schedule of Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of revenue	$ 266,746	$ 244,459
Tax expense	24,917	22,083
Gain, net of tax	111,856	102,709
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	1,341	1,411
Tax expense	240	249
Gain, net of tax	$ 1,101	$ 1,162