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Note 11 - Components of AOCI (Details) - Reclassification out of Accumulated Other Comprehensive Income [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)
Commodity Contract [Member] | Fuel Expense [Member]
Losses on cash flow hedges
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, before tax	$ 5,036
Commodity Contract [Member] | Income Tax Expense [Member]
Losses on cash flow hedges
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, before tax	(1,939)
Commodity Contract [Member]
Losses on cash flow hedges
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, net of tax	3,097
Interest Rate Cap [Member] | Interest Expense [Member]
Losses on cash flow hedges
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, before tax	143
Interest Rate Cap [Member] | Income Tax Benefit [Member]
Losses on cash flow hedges
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, before tax	(55)
Interest Rate Cap [Member]
Losses on cash flow hedges
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, before tax	$ 88

X

- References

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- Definition

Amount before tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph c
-URI http://asc.fasb.org/extlink&oid=64837297&loc=d3e41638-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e689-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580

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- Definition

Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e689-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph c
-URI http://asc.fasb.org/extlink&oid=64837297&loc=d3e41638-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580

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