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Accounts Receivable Discount Programs (Details) - USD ($)
 3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Accounts Receivable Discount Programs [Abstract]    
Receivables discounted $ 86,520,000 $ 80,649,000
Weighted average days 342 days 341 days
Annualized weighted average discount rate 3.10% 2.70%
Amount of discount as interest expense $ 2,522,000 $ 2,068,000