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Fair Value Measurements (Schedule Of Fair Value Of Assets And Liabilities Measured On Recurring Basis) (Details) (USD $) | Jun. 30, 2014 | Dec. 31, 2013
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Prepaid Expense and Other Assets [Abstract] |  |  |  |
Carrying value of notes receivable |  |  | $ 5,100,000 |
Measured At Fair Value On Recurring Basis [Member] | Money Market Funds [Member] |  |  |  |
Prepaid Expense and Other Assets [Abstract] |  |  |  |
Fair value of Assets | 173,122,000 | [1] | 153,109,000 | [1]
Measured At Fair Value On Recurring Basis [Member] | Money Market Funds [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |  |  |
Prepaid Expense and Other Assets [Abstract] |  |  |  |
Fair value of Assets | 173,122,000 | [1] | 153,109,000 | [1]
Measured At Fair Value On Recurring Basis [Member] | Equity Mutual Funds [Member] |  |  |  |
Prepaid Expense and Other Assets [Abstract] |  |  |  |
Fair value of Assets | 2,796,000 | [2] | 2,847,000 | [2]
Measured At Fair Value On Recurring Basis [Member] | Equity Mutual Funds [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |  |  |
Prepaid Expense and Other Assets [Abstract] |  |  |  |
Fair value of Assets | 2,796,000 | [2] | 2,847,000 | [2]
Measured At Fair Value On Recurring Basis [Member] | Foreign Currency Exchange Contracts [Member] |  |  |  |
Prepaid Expense and Other Assets [Abstract] |  |  |  |
Fair value of Assets | 1,317,000 | [3] | 4,044,000 | [3]
Fair value of Liabilities | 3,220,000 | [3] | 3,096,000 | [3]
Measured At Fair Value On Recurring Basis [Member] | Foreign Currency Exchange Contracts [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Prepaid Expense and Other Assets [Abstract] |  |  |  |
Fair value of Assets | 1,317,000 | [3] | 4,044,000 | [3]
Fair value of Liabilities | 3,220,000 | [3] | 3,096,000 | [3]
Measured At Fair Value On Recurring Basis [Member] | Deferred Compensation [Member] |  |  |  |
Prepaid Expense and Other Assets [Abstract] |  |  |  |
Fair value of Liabilities | 2,796,000 | [4] | 2,847,000 | [4]
Measured At Fair Value On Recurring Basis [Member] | Deferred Compensation [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |  |  |
Prepaid Expense and Other Assets [Abstract] |  |  |  |
Fair value of Liabilities | 2,796,000 | [4] | 2,847,000 | [4]
Measured At Fair Value On Recurring Basis [Member] | Interest Rate Swaps [Member] |  |  |  |
Prepaid Expense and Other Assets [Abstract] |  |  |  |
Fair value of Liabilities | 1,598,000 | [5] | 1,821,000 | [5]
Measured At Fair Value On Recurring Basis [Member] | Interest Rate Swaps [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Prepaid Expense and Other Assets [Abstract] |  |  |  |
Fair value of Liabilities | $ 1,598,000 | [5] | $ 1,821,000 | [5]
[1] | Money market funds are included within cash and cash equivalents. The remaining balance of cash and cash equivalents as of June 30, 2014 and December 31, 2013 consisted of demand deposits.
[2] | Equity mutual funds relate to a deferred compensation plan that was assumed as part of a previous business combination. This amount is included within other long-term assets, net. See number (4) below for a discussion of the related deferred compensation liability.
[3] | Foreign currency exchange contracts are included within other current assets; other long-term assets, net; accrued liabilities; or other long-term liabilities depending on the gain (loss) position and anticipated settlement date.
[4] | A deferred compensation plan assumed as part of a previous business combination is included within other long-term liabilities. The fair value of our deferred compensation plan is indexed to the performance of the underlying equity mutual funds discussed in number (2) above.
[5] | Interest rate swaps are included within accrued liabilities.

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- Definition Amounts due from parties associated with the reporting entity as evidenced by a written promise to pay, due after 1 year (or 1 business cycle). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Subparagraph 1 -Article 4 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.11) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Related Parties -URI http://asc.fasb.org/extlink&oid=16382449 + Details
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