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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	$ 79,957us-gaap_NetIncomeLoss	$ 49,217us-gaap_NetIncomeLoss	$ 62,455us-gaap_NetIncomeLoss
Other comprehensive income before tax and net of reclassification adjustments:
Change in fair value of interest rate swaps	789us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	892us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	317us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
Change in fair value of available-for-sale securities	427us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Other comprehensive income, before tax	1,216us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	892us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	317us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
Income tax expense related to components of other comprehensive income	474us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	338us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	124us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1
Other comprehensive income, net of tax	742us-gaap_OtherComprehensiveIncomeLossNetOfTax	554us-gaap_OtherComprehensiveIncomeLossNetOfTax	193us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income	$ 80,699us-gaap_ComprehensiveIncomeNetOfTax	$ 49,771us-gaap_ComprehensiveIncomeNetOfTax	$ 62,648us-gaap_ComprehensiveIncomeNetOfTax

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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