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Financial Instruments - Schedule of Notional Amounts of Outstanding Derivative Positions (Details) (Interest Rate Contract [Member], USD $)
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3 Months Ended | |||||||
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Mar. 31, 2014
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Mar. 31, 2014
Effective Date August 14, 2012 [Domain]
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Mar. 31, 2014
Noncurrent Derivative Assets [Member]
Not Designated as Hedging Instrument [Member]
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Dec. 31, 2013
Noncurrent Derivative Assets [Member]
Not Designated as Hedging Instrument [Member]
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Mar. 31, 2014
Other Current Liabilities [Member]
Not Designated as Hedging Instrument [Member]
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Dec. 31, 2013
Other Current Liabilities [Member]
Not Designated as Hedging Instrument [Member]
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Mar. 31, 2014
Maximum [Member]
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Mar. 31, 2014
Maximum [Member]
Effective Date August 14, 2012 [Domain]
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| Derivative [Line Items] | ||||||||
| Notional Amount of Interest Rate Derivatives | $ 0 | $ 20.0 | $ 671,000,000 | $ 2,900,000,000 | ||||
| Interest Rate Derivative Assets, at Fair Value | 71,170,000 | 98,123,000 | ||||||
| Derivative instrument average fixed rate (percent) | 2.05% | 1.98% | ||||||
| Debt Instrument, Description of Variable Rate Basis | One-month LIBOR | One-month LIBOR | ||||||
| Derivative, Inception Date | Jun. 05, 2013 | Aug. 14, 2012 | ||||||
| Derivative, Maturity Date | May 28, 2020 | Jul. 31, 2019 | ||||||
| Interest Rate Derivative Liabilities, at Fair Value | $ (19,544,000) | $ (13,484,000) | ||||||