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Amendment of Revolving Credit Facility Amendment of Revolving Credit Facility (Details) (USD $) | 3 Months Ended |  | 0 Months Ended |  | 0 Months Ended |  | 0 Months Ended |
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Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2013 Revolving Credit Facility London Interbank Offered Rate (LIBOR) | Oct. 31, 2010 Revolving Credit Facility London Interbank Offered Rate (LIBOR) | Apr. 24, 2013 Subsequent Event Revolving Credit Facility London Interbank Offered Rate (LIBOR) | Apr. 23, 2013 Subsequent Event Revolving Credit Facility London Interbank Offered Rate (LIBOR) | Apr. 24, 2013 Subsequent Event Maximum Revolving Credit Facility London Interbank Offered Rate (LIBOR) | Apr. 23, 2013 Subsequent Event Maximum Revolving Credit Facility London Interbank Offered Rate (LIBOR) | Apr. 24, 2013 Subsequent Event Minimum Revolving Credit Facility London Interbank Offered Rate (LIBOR) | Apr. 23, 2013 Subsequent Event Minimum Revolving Credit Facility London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 375,000,000 |  | $ 500,000,000 |  |  |  |
Debt Instrument additional amount |  |  |  |  |  | 225,000,000 |  |  |  |
Loan origination fees | $ (49,000) | $ 0 |  |  | $ 2,000,000 |  |  |  |  |
Maturity Term |  |  |  |  | 5 years |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  | LIBOR |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  | 3.00% |  | 1.125%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  |  |  |  |  | 0.45% |  | 0.175% |
Line of Credit Facility, Covenant Terms, Interest Coverage Ratio |  |  |  |  |  |  |  |  | 3.0 |
Line of Credit Facility, Covenant Terms, Leverage Ratio |  |  |  |  |  |  | 5.0 |  | 4.5 |
Line of Credit Facility, Covenant Terms,SeniorSecuredLeverage Ratio |  |  |  |  |  |  | 3.5 |  |  |

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- Definition Line of Credit Facility, Covenant Terms, Interest Coverage Ratio + References No definition available. + Details
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- Definition Line of Credit Facility, Covenant Terms, Leverage Ratio + References No definition available. + Details
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- Definition Line of Credit Facility, Covenant Terms,Senior Secured Leverage Ratio + References No definition available. + Details
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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -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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