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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	$ 138,720us-gaap_NetIncomeLoss	$ 106,000us-gaap_NetIncomeLoss	$ 80,362us-gaap_NetIncomeLoss
Gain on cash flow hedges, net of tax expense of $380, $668 and $1,175	612	1,077	1,893
Comprehensive income	$ 139,332us-gaap_ComprehensiveIncomeNetOfTax	$ 107,077us-gaap_ComprehensiveIncomeNetOfTax	$ 82,255us-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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