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Financial Instruments - Changes in Fair Value of De-Designated Interest Rate Derivatives (Details) (Not Designated as Hedging Instrument [Member], Interest Rate Contract [Member], USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]
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| Derivative [Line Items] | ||||
| Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | $ 101,263 | $ 0 | $ 83,279 | $ 0 |