Consolidated Statements Of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Consolidated Statements OF Comprehensive Income [Abstract]
Net income	$ 37,680	$ (38,460)	$ 76,954	$ 12,323
Other comprehensive income, net of tax (see Note 13)	2,890	6,746	5,929	13,492
Comprehensive income (loss)	40,570	(31,714)	82,883	25,815
Less: Income attributable to the noncontrolling interest in a partnership				2,643
Comprehensive income (loss) attributable to the common shareholders of Frontier	$ 40,570	$ (31,714)	$ 82,883	$ 23,172