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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
Statements of Comprehensive Income [Abstract]
Net income	$ 46,356us-gaap_NetIncomeLoss	$ 16,425us-gaap_NetIncomeLoss	$ 65,930us-gaap_NetIncomeLoss
Other comprehensive income:
Change in fair value of derivative instrument, net of income tax	60us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	764us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	(125)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Comprehensive income	$ 46,416us-gaap_ComprehensiveIncomeNetOfTax	$ 17,189us-gaap_ComprehensiveIncomeNetOfTax	$ 65,805us-gaap_ComprehensiveIncomeNetOfTax

X

- Definition

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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-Name Accounting Standards Codification



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

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Amount after tax and reclassification adjustments, 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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