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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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Other (expense) income, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Net Gain (Loss) Recognized in Income on Derivative Instruments $ (50) $ 637 $ (9,908) $ 978