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Acquisitions (Pro Forma) (Details) - C.B. Fleet Company, Inc. - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]    
Revenues $ 265,967 $ 526,743
Net income $ 32,358 $ 26,428
Earnings per share:    
Basic EPS (in USD per share) $ 0.61 $ 0.50
Diluted EPS (in USD per share) $ 0.61 $ 0.50