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Derivatives and Hedging - Location of Gains in Consolidated Condensed Statements of Operations that were Recognized and Derivative Contract Type (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Other (expense) income, net    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Net Gain (Loss) Recognized in Income on Derivative Instruments $ (6,312) $ 2,592