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Derivative Instruments (Narrative) (Details) (USD $) | 3 Months Ended |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2012 | Mar. 31, 2011 | Mar. 31, 2012 Interest Rate Exchange Agreement Expiring 2012 [Member] | Mar. 31, 2012 Interest Rate Exchange Agreement Expiring 2011 [Member] | Mar. 31, 2012 Interest Rate Exchange Agreement Expiring 2010 [Member] Y | Mar. 31, 2012 Interest Rate Exchange Agreements Expiring 2011 And 2012 [Member] Y | Dec. 09, 2011 4.2% Senior Notes [Member] | Dec. 06, 2010 4.5 % Senior Notes [Member]
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Interest rate contract with notional amount |  |  | $ 350,000,000 | $ 350,000,000 | $ 300,000,000 |  |  |
Interest rate on senior notes |  |  |  |  |  |  | 4.20% | 4.50%
Interest rate exchange agreement expiration date |  |  | February 28, 2012 | September 30, 2011 | December 2010 |  |  |
Notional amount |  |  | 4,000,000 | 34,700,000 | 31,000,000 |  |  |
Settlement amount interest rate contract |  |  |  |  |  | 38,700,000 |  |
Amortization interest expense | 369,000 | 251,000 |  |  | 31,000,000 | 37,900,000 |  |
Term of amortized interest expense, years |  |  |  |  | 10 | 10 |  |
Interest rate |  |  |  |  | 5.80% | 5.30% |  |
Other expense | 800,000 |  |  |  |  |  |  |
Amount to be recognized from hedged transactions within 12 months, approximate | $ 7,600,000 |  |  |  |  |  |  |

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- Definition The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5618551-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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