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Income Taxes (Schedule Of Additional Information Related To Unrecognized Uncertain Tax Positions) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2011
Income Tax Disclosure [Abstract] |  |  |  |
Gross unrecognized tax benefits on uncertain tax positions (reflected in current income tax and other noncurrent liability accounts in the balance sheet) | $ 4,049 | $ 3,255 | $ 2,239 | $ 910
Deferred income tax assets related to unrecognized tax benefits on uncertain tax positions (reflected in deferred income tax accounts in the balance sheet) | (858) | (726) | (540) |
Net unrecognized tax benefits on uncertain tax positions, which would impact the effective tax rate if recognized | 3,191 | 2,529 | 1,699 |
Interest and penalties accrued on deductions taken relating to uncertain tax positions (approximately $90, $150 and $100 reflected in income tax expense in the income statement in 2015, 2014 and 2013, respectively, with the balance shown in current income tax and other noncurrent liability accounts in the balance sheet) | 397 | 310 | 156 |
Interest and penalties accrued on deductions taken relating to uncertain tax positions, reflected in income tax expense in the income statement | 90 | 150 | 100 |
Related deferred income tax assets recognized on interest and penalties | (148) | (116) | (60) |
Interest and penalties accrued on uncertain tax positions net of related deferred income tax benefits, which would impact the effective tax rate if recognized | 249 | 194 | 96 |
Total net unrecognized tax benefits on uncertain tax positions reflected in the balance sheet, which would impact the effective tax rate if recognized | $ 3,440 | $ 2,723 | $ 1,795 |

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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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