Condensed Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 46,373	$ 41,240	$ 88,490	$ 80,178
Other comprehensive (loss) income, net of tax	(34,228)	2,567	(32,873)	16,326
Comprehensive income	$ 12,145	$ 43,807	$ 55,617	$ 96,504