CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014		Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (27,508)	$ 118,420		$ 12,747	$ 225,451
Other comprehensive income (loss), net of taxes:
Reclassification adjustment for settled cash flow hedge contracts	0	13,807	[1]	0	56,372	[1]
Changes in fair value of cash flow hedge contracts	0	0		0	(80,175)	[2]
Total other comprehensive income (loss)	0	13,807		0	(23,803)
Comprehensive income (loss)	$ (27,508)	$ 132,227		$ 12,747	$ 201,648

[1] Net of income taxes of $(9,149) and $(37,359) for the three and six months ended June 30, 2014, respectively.

[2] Net of income taxes of $53,135 for the six months ended June 30, 2014.