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Fair Value of Financial Instruments (Details) - Recurring - Level 3 - Cross currency swaps - USD ($)
$ in Thousands
Dec. 31, 2015
Sep. 30, 2015
Accrued Expenses and Other Current Liabilities    
Fair value measurements    
Derivative liabilities $ (2,174) $ (2,715)
Other Assets    
Fair value measurements    
Derivative assets $ 14,145 $ 6,852