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Financial Instruments - Notional Amounts of Derivative Instruments (Details) (Interest Rate Contract [Member], USD $)
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12 Months Ended | 84 Months Ended | 12 Months Ended | 84 Months Ended | ||||||||||
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Dec. 31, 2013
Effective Date June 5, 2013 [Domain]
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May 28, 2020
Effective Date June 5, 2013 [Domain]
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Dec. 31, 2013
Effective Date June 5, 2013 [Domain]
Maximum [Member]
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Dec. 31, 2013
Effective Date August 14, 2012 [Domain]
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Jul. 31, 2019
Effective Date August 14, 2012 [Domain]
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Dec. 31, 2013
Effective Date August 14, 2012 [Domain]
Maximum [Member]
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Dec. 31, 2013
Noncurrent Derivative Assets [Member]
Not Designated as Hedging Instrument [Member]
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Dec. 31, 2012
Noncurrent Derivative Assets [Member]
Not Designated as Hedging Instrument [Member]
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Dec. 31, 2013
Other Liabilities [Member]
Not Designated as Hedging Instrument [Member]
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Dec. 31, 2012
Other Liabilities [Member]
Not Designated as Hedging Instrument [Member]
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Dec. 31, 2013
Non-current Liabilities [Member]
Not Designated as Hedging Instrument [Member]
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Dec. 31, 2012
Non-current Liabilities [Member]
Not Designated as Hedging Instrument [Member]
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Dec. 31, 2013
Non-current Liabilities [Member]
Designated as Hedging Instrument [Member]
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Dec. 31, 2012
Non-current Liabilities [Member]
Designated as Hedging Instrument [Member]
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| Derivative [Line Items] | ||||||||||||||
| Interest Rate Derivative Liabilities, at Fair Value | $ 13,484,000 | $ 0 | $ 0 | $ 5,134,000 | $ 0 | $ 21,290,000 | ||||||||
| Interest Rate Derivative Assets, at Fair Value | 98,123,000 | 0 | ||||||||||||
| Notional Amount of Interest Rate Derivatives | $ 0 | $ 0 | $ 0 | $ 0 | ||||||||||
| Derivative, Inception Date | Jun. 05, 2013 | Aug. 14, 2012 | ||||||||||||
| Derivative, Maturity Date | May 28, 2020 | Jul. 31, 2019 | ||||||||||||
| Derivative, Average Fixed Interest Rate | 2.05% | 1.98% | ||||||||||||
| Debt Instrument, Description of Variable Rate Basis | One-month LIBOR | One-month LIBOR | ||||||||||||