Condensed Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 56,945	$ 40,206
Other comprehensive income, net of taxes:
Change in value of derivative instruments used as cash flow hedges, net of tax of $0 and ($6,378)	0	(9,911)
Reclassification - derivative settlements, net of tax of $0 and ($1,494)	0	(2,337)
Ineffective portion of derivatives, net of tax of $0 and $526	0	823
Comprehensive income	$ 56,945	$ 28,781