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Shareholders' Equity - Summary of dividends declared (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 31, 2017
USD ($)
$ / shares
May 9, 2016  
Stockholders Equity Note [Line Items]  
Declaration Date May 09, 2016
Per Share Dividend | $ / shares $ 0.19
Record Date May 20, 2016
Total Amount (In thousands) | $ $ 3,884
Payment Date May 27, 2016
July 25, 2016  
Stockholders Equity Note [Line Items]  
Declaration Date Jul. 25, 2016
Per Share Dividend | $ / shares $ 0.19
Record Date Aug. 08, 2016
Total Amount (In thousands) | $ $ 3,900
Payment Date Aug. 19, 2016
October 24, 2016  
Stockholders Equity Note [Line Items]  
Declaration Date Oct. 24, 2016
Per Share Dividend | $ / shares $ 0.19
Record Date Nov. 07, 2016
Total Amount (In thousands) | $ $ 3,900
Payment Date Nov. 18, 2016
January 23, 2017  
Stockholders Equity Note [Line Items]  
Declaration Date Jan. 23, 2017
Per Share Dividend | $ / shares $ 0.19
Record Date Feb. 06, 2017
Total Amount (In thousands) | $ $ 3,900
Payment Date Feb. 17, 2017