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Income Taxes (Schedule Of Federal Statutory Income Tax Rate To Income Before Income Tax) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Taxes [Abstract]      
Tax at statutory rate $ 11,664 $ 24,852 $ 24,294
State taxes, net of federal tax effect 7,553 384 1,102
Effect of foreign operations and tax incentives (11,945) (20,703) (15,496)
Change in valuation allowance 2,114 (203) (1,152)
Excess tax-benefits of stock-based compensation (143) (1,658) 0
Provisional impact of U.S. Tax Reform (4,353) 97,707 0
Impact of cash repatriation 21,612 0 0
Global Intangible Low-Taxed Income 3,206 0 0
Losses in foreign jurisdictions for which no benefit has been provided 1,423 106 2,106
Change in uncertain tax benefits reserve (317) 0 (8,270)
Other 1,910 2,421 2,893
Total income tax expense $ 32,724 $ 102,906 $ 5,477