Income Taxes (Schedule of Deferred Tax Assets and Deferred Tax Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Accrued expenses	$ 56,913	$ 63,080
Tax credits and separate return net operating losses	12,939	17,976
Deferred Tax Asset, Contract and service revenues and costs	28,001	9,383
Share based compensation	30,216	49,650
Deferred Tax Assets, Lease Liability	21,548	23,928
Other	15,070	17,554
Gross deferred tax assets	164,687	181,571
Valuation Allowance	(9,575)	(3,384)
Total deferred tax assets	155,112	178,187
Deferred tax liabilities:
Software development costs	(265,384)	(270,041)
Depreciation and amortization	(204,203)	(204,568)
Prepaid expenses	(39,499)	(37,547)
Deferred Tax Liability, Lease Right-of-use Asset	(17,900)	(20,639)
Other	(11,253)	(9,260)
Total deferred tax liabilities	(538,239)	(542,055)
Net deferred tax liability	$ (383,127)	$ (363,868)