CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 40,255	$ 107,031
Other comprehensive income (loss), net of taxes:
Reclassification adjustment for settled cash flow hedge contracts	0	42,565	[1]
Changes in fair value of cash flow hedge contracts	0	(80,175)	[2]
Total other comprehensive income (loss)	0	(37,610)
Comprehensive income (loss)	$ 40,255	$ 69,421

[1] Net of income taxes of $(28,210) for the three months ended March 31, 2014.

[2] Net of income taxes of $53,135 for the three months ended March 31, 2014.