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Terms of Interest Rate Swap Agreements (Details)
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Dec. 31, 2012
3.31%
USD ($)
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Dec. 31, 2012
2.86%
USD ($)
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Dec. 31, 2012
2.95%
USD ($)
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Dec. 31, 2012
2.94% Maturity On October 31, 2016
USD ($)
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Dec. 31, 2012
2.94% Maturity On December 30, 2016
USD ($)
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Dec. 31, 2012
3.11%
GBP (£)
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Dec. 31, 2012
3.17%
CAD
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| Derivative [Line Items] | ||||||||||||||||
| Notional Amount | $ 250,000,000 | $ 100,000,000 | $ 60,000,000 | $ 60,000,000 | $ 50,000,000 | £ 50,000,000 | 25,000,000 | |||||||||
| Fixed Interest Rate | 3.31% | [1] | 2.86% | [1] | 2.95% | [1] | 2.94% | [1] | 2.94% | [1] | 3.11% | [1] | 3.17% | [1] | ||
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