Income Taxes (Reconciliation Of Unrecognized Tax Benefits) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Balance at January 1	$ 12,641	$ 2,425	$ 1,864
Additions due to merger with Frontier	0	0	22,577
Additions for tax positions of prior years	25,728	10,305	73
Reductions for tax positions of prior years	(5,092)	(89)	(204)
Settlements	(24,271)	0	(21,679)
Reductions for statute limitations	0	0	(206)
Balance at December 31	$ 9,006	$ 12,641	$ 2,425