Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Consolidated Statements OF Comprehensive Income [Abstract]
Net income	$ 41,993	$ 35,400	$ 118,947	$ 47,723
Pension settlement costs, net of tax (see Notes 14 and 15)		24,992		24,992
Other comprehensive income, net of tax (see Note 14)	2,460	6,313	8,389	19,805
Comprehensive income	44,453	66,705	127,336	92,520
Less: Income attributable to the noncontrolling interest in a partnership				2,643
Comprehensive income attributable to the common shareholders of Frontier	$ 44,453	$ 66,705	$ 127,336	$ 89,877