CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) [Abstract]
Net income	$ 71,626	$ 22,320	$ 124,115	$ 112,360
Other comprehensive income, net of tax (see Note 15)	2,308	3,334	12,142	8,324
Comprehensive income	73,934	25,654	136,257	120,684
Less: Comprehensive income attributable to the noncontrolling interest in a partnership	(4,626)	(1,925)	(12,358)	(4,993)
Comprehensive income attributable to the common shareholders of Frontier	$ 69,308	$ 23,729	$ 123,899	$ 115,691

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the economic entity, including both controlling (parent) and noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, including any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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- Definition

This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, and noncontrolling interest.

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- Definition

Amount of net Income or Loss for the period allocated to noncontrolling partners of a limited partnership included in the entity's consolidated financial statements.

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