Income Taxes (Schedule Of Effective Income Tax Reconciliation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Tax at statutory rate	$ 56,621	$ 49,599	$ 60,608
State income taxes, net of federal tax benefits	4,641	5,132	6,273
Non-deductible meals and entertainment	1,497	1,577	2,686
Income tax credits	(1,600)	(1,574)	(758)
Other, net	1,965	192	1,323
Total income tax expense	$ 63,124us-gaap_IncomeTaxExpenseBenefit	$ 54,926us-gaap_IncomeTaxExpenseBenefit	$ 70,132us-gaap_IncomeTaxExpenseBenefit

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

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-Paragraph 1

-Subparagraph (SX 210.4-08.(h))

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

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-Glossary Income Tax Expense (or Benefit)

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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-Publisher FASB

-Name Accounting Standards Codification

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible meals and entertainment expense.

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