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Summary of Significant Accounting Policies (Details 4) (Designated as hedges, CRNF, USD $) In Millions, unless otherwise specified |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2012 Interest rate swap agreements agreement | Jul. 01, 2011 Interest rate swap agreements agreement | Dec. 31, 2012 Interest rate swap agreements entered into on June 30, 2011 D | Dec. 31, 2012 Interest rate swap agreements entered into on July 1, 2011 D
Derivative Financial Instruments |  |  |  |
Borrowing capacity | $ 125.0 |  |  |
Aggregate notional amount | $ 62.5 |  |  |
Average fixed rate of interest (as a percent) | 1.96% |  |  |
Number of agreements | 2 | 2 |  |
Floating rate basis |  |  | Three months LIBOR | Three months LIBOR
Fixed rate (as a percent) |  |  | 1.94% | 1.975%
Settlement period (in days) |  |  | 90 | 90

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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