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Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

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Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Amount of lessee's right to use underlying asset under operating lease.

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Weighted average discount rate for operating lease calculated at point in time.

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The aggregate cash inflow comprised of the amount received from (a) employees to acquire the entity's shares under incentive awards, including stock option exercises and restricted stock arrangements, and (b) the excess tax benefit arising from such transactions.

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Basis Of Presentation (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2019	Dec. 31, 2018
Lease right of use assets	$ 87,811
Lease liabilities	$ 98,659
Weighted average rate	3.47%
Effective tax rate	12.10%	19.90%
Excess tax benefit on stock options reduced income tax expense	$ 6,700	$ 3,800
Capitalized property and equipment	2,100			$ 3,200
ASU No. 2016-02 [Member]
Weighted average rate			3.47%
Cloud Computing [Member] \| ASU No. 2018-15 [Member]
Capitalized contract cost	2,600
Capitalized contract cost, amortization expense	$ 0