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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Comprehensive income:
Net income	$ 110,966us-gaap_NetIncomeLoss	$ 118,403us-gaap_NetIncomeLoss
Derivative instruments:
Net fair value increase (decrease), net of tax of $(3) and $(2), respectively	(5)	(3)
Reclassification of gains to net income, net of tax of $(64) and $(73), respectively	(105)	(120)
Other comprehensive loss	(110)	(123)
Comprehensive income	$ 110,856us-gaap_ComprehensiveIncomeNetOfTax	$ 118,280us-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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