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Fair Value Disclosure - Summarizes Levels in Fair Value Hierarchy of Financial Instruments (Details) - Estimate of Fair Value [Member] - USD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments $ (14,499) $ (5,644)
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments $ (14,499) $ (5,644)