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Financial Instruments - Fair Value of Interest Rate Derivatives by Balance Sheet Location (Details) (Interest Rate Contract [Member], USD $)
In Thousands, unless otherwise specified |
Jun. 30, 2013
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Dec. 31, 2012
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|---|---|---|
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Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Interest Rate Derivative Liabilities, at Fair Value | $ 0 | $ 21,290 |
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Not Designated as Hedging Instrument [Member] | Non-current Liabilities [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Interest Rate Derivative Liabilities, at Fair Value | 0 | 5,134 |
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Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Interest Rate Derivative Liabilities, at Fair Value | 3,555 | 0 |
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Not Designated as Hedging Instrument [Member] | Noncurrent Derivative Assets [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Interest Rate Derivative Assets, at Fair Value | $ 81,762 | $ 0 |