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Fair Value Measurements Carrying Amounts and Fair Values (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Current maturities of long-term debt $ (129,706)us-gaap_LongTermDebtCurrent $ (112,500)us-gaap_LongTermDebtCurrent
Long-term debt (621,849)us-gaap_LongTermDebtNoncurrent (1,461,724)us-gaap_LongTermDebtNoncurrent
Fuel hedge contracts 688us-gaap_DerivativeAssets [1] 1,781us-gaap_DerivativeAssets [1]
Carrying Amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 161,558us-gaap_CashAndCashEquivalentsFairValueDisclosure
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Restricted cash 6,688us-gaap_RestrictedCashAndCashEquivalents
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Long-term debt (621,849)us-gaap_LongTermDebtNoncurrent
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Carrying Amount [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate swaps (7,247)us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
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Fair Value [Member] | Fair Value, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 161,558us-gaap_CashAndCashEquivalentsFairValueDisclosure
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Restricted cash 6,688us-gaap_RestrictedCashAndCashEquivalents
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Fair Value [Member] | Fair Value, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
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Fair Value [Member] | Fair Value, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Foreign currency exchange contracts [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
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[1] See Note 7 — Fair Value Measurements for further information on the fair value of our derivatives including their classification within the fair value hierarchy.
[2] Restricted cash is recorded in “Other Assets” and represents the proceeds from LKE sales deposited with a third-party intermediary.
[3] See Note 6 — Derivative Financial Instruments and Hedging Activities for information regarding the Balance Sheet classification of the Company’s derivative financial instruments.