Net Income Per Common Share (Details) (USD $) In Thousands, except Share data	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Net income used for basic and diluted earnings per common share [Abstract]
Net income attributable to common shareholders of Frontier	$ 32,261	$ 35,121	$ 86,972	$ 77,686
Less: Dividends paid on unvested restricted stock awards	(955)	(734)	(1,921)	(1,375)
Total basic and diluted net income attributable to common shareholders of Frontier	$ 31,306	$ 34,387	$ 85,051	$ 76,311
Basic earnings per common share [Abstract]
Total weighted average shares and unvested restricted stock awards outstanding - basic	994,482	313,401	994,413	313,095
Less: Weighted average unvested restricted stock awards	(5,125)	(2,737)	(4,933)	(2,583)
Total weighted average shares outstanding - basic	989,357	310,664	989,480	310,512
Net income per share attributable to common shareholders of Frontier	$ 0.03	$ 0.11	$ 0.09	$ 0.25
Diluted earnings per common share [Abstract]
Total weighted average shares outstanding - basic	989,357	310,664	989,480	310,512
Effect of dilutive shares	805	0	1,446	286
Effect of dilutive stock units	0	473	442	0
Total weighted average shares outstanding - diluted	990,162	311,137	991,368	310,798
Net income per share attributable to common shareholders of Frontier	$ 0.03	$ 0.11	$ 0.09	$ 0.25
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computation of diluted earnings per share (in shares)	577,000	3,547,000	577,000	3,547,000
Exercise price range of stock options related to employee compensation plans - lower range limit	$ 9.52	$ 8.19	$ 9.52	$ 8.19
Exercise price range of stock options related to employee compensation plans - upper range limit	$ 14.15	$ 18.46	$ 14.15	$ 18.46
Non-Employee Directors' Deferred Fee Plan and Equity Plan [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computation of diluted earnings per share (in shares)			442,212	472,120

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