v3.19.1
SHAREHOLDER'S EQUITY (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Jun. 30, 2016
Dec. 31, 2018
Dec. 31, 2016
Dividends And Shares Activitiy [Line Items]          
Dvidend Equivalent liability - short term $ 1,878     $ 1,279  
Dvidend Equivalent liability - long term 888     1,041  
Total Dividend Equivalent Liability $ 2,766     2,320  
CommonStockDividendsPerShareDeclared $ 0.36        
Dividend payments $ 12,430 $ 12,441 $ 2,900    
Amount recorded as financing activity $ (1,426) (3,463)   (1,723)  
The total cost to repurchase   (19,379)   (10,028)  
Employee stock purchase plan, authorized shares 1,000        
Stock Issued During Period Value Employee Stock Purchase Plan $ 379 321   $ 1,107  
Total Non cash compensation expense recognized $ 2,825 3,097      
Espp Shares Market Value 85.00%        
Espp Share Discount 15.00%        
PaymentsOfDividendsAbstract          
Payments of Dividends, Common Stock $ 12,430 12,441 $ 2,900    
PaymentsOfDividendsPreferredStockAndPreferenceStock 0 $ 0      
Treasury Stock Line Items          
Stock Repurchase Prgram Authorized Amount $ 100,000        
Dividends          
Dividends And Shares Activitiy [Line Items]          
CommonStockDividendsPerShareDeclared         $ 0.3
ESPP [Member]          
Dividends And Shares Activitiy [Line Items]          
Stock Issued During Period Shares Employee Stock Purchase Plans 85 39      
Total Non cash compensation expense recognized $ 67 $ 57