Consolidated Statements Of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Consolidated Statements OF Comprehensive Income [Abstract]
Net income	$ 115,478	$ 153,314	$ 157,608
Pension settlement costs, net of tax (see Notes 14 and 17)	27,381
Other comprehensive income (loss), net of tax (see Note 14)	195,665	(96,613)	(157,414)
Comprehensive income	338,524	56,701	194
Less: Income attributable to the noncontrolling interest in a partnership	(2,643)	(16,678)	(7,994)
Comprehensive income (loss) attributable to the common shareholders of Frontier	$ 335,881	$ 40,023	$ (7,800)