Income Taxes Income Taxes (Reconciliation Of Unrecognized Tax Benefits) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Abstract]
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Transition Tax For Accumulated Foreign Earnings, Provisional Income Tax Expense	$ 0.000	$ 0.246	$ 0.00
Unrecognized Tax Benefits	51,271,000	45,012,000	41,218,000	$ 32,536,000
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	2,508,000	0	2,082,000
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions	0	(401,000)	0
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions	3,751,000	7,223,000	6,703,000
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	0	(2,639,000)	0
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	$ 0	$ (389,000)	$ (103,000)