Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical)

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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement Of Cash Flows [Abstract]      
Tax benefit/ expense on change in fair value of cash flow hedging instruments $ 1,769us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax $ 6,514us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax $ 1,035us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax