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Debt (Schedule Of Debt Outstanding) (Details) (USD $)
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0 Months Ended | 3 Months Ended | 3 Months Ended | 3 Months Ended | 3 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
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Jan. 06, 2012
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Mar. 31, 2012
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Dec. 31, 2011
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Mar. 31, 2012
Revolving Credit Facility [Member]
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Dec. 31, 2011
Revolving Credit Facility [Member]
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Mar. 31, 2012
Senior Notes 6.25% Due 2013 [Member]
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Dec. 31, 2011
Senior Notes 6.25% Due 2013 [Member]
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Mar. 31, 2012
Senior Notes 6.75% Due 2014 [Member]
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Dec. 31, 2011
Senior Notes 6.75% Due 2014 [Member]
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Mar. 31, 2012
Senior Notes 7.75% Due 2017 [Member]
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Dec. 31, 2011
Senior Notes 7.75% Due 2017 [Member]
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| Debt Instrument [Line Items] | |||||||||||
| Long-term debt | $ 1,180,386,000 | $ 1,245,014,000 | $ 535,000,000 | $ 265,000,000 | $ 40,000,000 | $ 375,000,000 | $ 150,000,000 | $ 150,000,000 | $ 455,386,000 | $ 455,014,000 | |
| Revolving Credit Facility maturity date | December 2016 | ||||||||||
| Note maturity date | Mar. 15, 2013 | Jan. 31, 2014 | Jun. 01, 2017 | ||||||||
| Weighted average rate | 1.70% | 1.00% | |||||||||
| Interest rate stated percentage of Senior Notes | 6.25% | 6.75% | 7.75% | ||||||||
| Senior Notes interest payable dates | interest payable periodically at variable interest rates. | interest payable semi-annually in March and September at 6.25%. | interest payable semi-annually in January and July at 6.75%. | interest payable semi-annually in June and December at 7.75%. | |||||||
| Notes issued with a discount | 13,400,000 | ||||||||||
| Notes, unamortized | $ 9,600,000 | $ 10,000,000 |