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Long-term Debt (Schedule Of Long-Term Debt) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term debt and capital lease obligation	$ 541,124	$ 490,920
Senior Notes [Member]
Debt Instrument [Line Items]
Long-term debt and capital lease obligation	$ 346,066	345,920
Senior notes, interest rate	4.10%
Senior notes, maturity date	2022
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt and capital lease obligation	$ 190,000	145,000
Capital Lease Obligation [Member]
Debt Instrument [Line Items]
Long-term debt and capital lease obligation	$ 5,058	$ 0

X

- Definition

Debt instruments maturity date.

+ References

No definition available.

+ Details

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X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section H

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- Details

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X

- Details

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- Details

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