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Fair Value of Financial Instruments (Details) (USD $)
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12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Derivatives, Fair Value [Line Items] | |||
| Percentage of fuel cost of operating expenses (in hundredths) | 4.20% | 3.80% | 3.40% |
| Derivative agreements (in dollars per gallon) | 3.55 | 3.50 | 2.68 |
| Derivative Instruments, Gain (Loss) [Line Items] | |||
| Unrealized loss on derivative instrument | $ 143,000 | $ 257,000 | $ 800,000 |
| Cash settlements under derivative contracts | 1,131,000 | ||
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Estimate of Fair Value
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| Fair value of financial instruments [Abstract] | |||
| Long-term debt, fair value disclosure | 513,436,000 | 406,856,000 | |
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Carrying (Reported) Amount
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| Fair value of financial instruments [Abstract] | |||
| Long-term debt, fair value disclosure | 516,453,000 | 404,478,000 | |
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Aircraft operations expense
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| Derivative Instruments, Gain (Loss) [Line Items] | |||
| Unrealized loss on derivative instrument | $ 143,000 | $ 257,000 | $ 800,000 |