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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income	$ 136,276us-gaap_NetIncomeLoss	$ 184,746us-gaap_NetIncomeLoss	$ 23,176us-gaap_NetIncomeLoss
Change in value of derivative instruments used as cash flow hedges, net of tax of $0, ($4,717), and $12,094	0	(7,349)	18,635
Reclassification - derivative settlements, net of tax of $0, ($249), and ($20,171)	0	(354)	(31,682)
Ineffective portion of derivatives, net of tax of $0, $74, and $1,008	0	116	1,608
Total comprehensive income	$ 136,276us-gaap_ComprehensiveIncomeNetOfTax	$ 177,159us-gaap_ComprehensiveIncomeNetOfTax	$ 11,737us-gaap_ComprehensiveIncomeNetOfTax

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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- Definition

Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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