Quarterly report pursuant to Section 13 or 15(d)

Consolidated Statements of Cash Flows (Parenthetical)

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Consolidated Statements of Cash Flows (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Statement Of Cash Flows [Abstract]    
Tax benefit/ expense on change in fair value of cash flow hedging instruments $ 636 $ 1,094