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Derivative Financial Instruments Derivative Financial Instruments Narrative (Details) (USD $)
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3 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
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Mar. 31, 2013
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Dec. 31, 2012
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Mar. 31, 2012
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Dec. 31, 2011
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Mar. 31, 2013
Minimum [Member]
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Mar. 31, 2013
Maximum [Member]
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Mar. 31, 2013
contracts
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Mar. 31, 2013
Forward Contracts [Member]
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Mar. 31, 2013
Net Investment Hedging [Member]
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Mar. 31, 2013
Secured Debt [Member]
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Dec. 31, 2012
Secured Debt [Member]
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| Net unrealized loss on hedging instruments | $ (16,142,000) | $ (16,069,000) | $ (14,380,000) | $ (14,380,000) | $ (14,400,000) | ||||||
| Number of Interest Rate Derivatives Held | 6 | ||||||||||
| Notional Amount of Interest Rate Derivatives | 200,000,000 | ||||||||||
| Long-term Debt | 398,750,000 | 417,500,000 | |||||||||
| Pay fixed interest rate in interst rate swap | 1.00% | ||||||||||
| Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net | (963,000) | ||||||||||
| Number of foreign exchange forward contracts entered into YTD | 118 | ||||||||||
| Notional amount of foreign currency forward contracts | $ 258,000 | $ 11,000,000 | |||||||||