v3.10.0.1
SHAREHOLDER'S EQUITY (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 30, 2017
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dividends And Shares Activitiy [Line Items]              
Dvidend Equivalent liability - short term   $ 1,449 $ 830   $ 1,449   $ 830
Dvidend Equivalent liability - long term   905 1,331   905   1,331
Total Dividend Equivalent Liability   2,354 2,161   $ 2,354   $ 2,161
CommonStockDividendsPerShareDeclared         $ 0.36    
Dividend payments   $ 12,500   $ 2,900 $ 37,403 $ 16,550  
Amount recorded as financing activity     (19)   (5,179) (2,546)  
The total cost to repurchase     (10,675)   $ (19,379) 0  
Dividends paid on preferred stock     $ 924     1,650  
Employee stock purchase plan, authorized shares   1,000     1,000    
Stock Issued During Period Value Employee Stock Purchase Plan         $ 1,051 182  
Total Non cash compensation expense recognized   $ 2,982   1,032 $ 9,036 3,101  
Espp Shares Market Value   85.00%     85.00%    
Espp Share Discount   15.00%     15.00%    
Dividends Paid on Common Stock - Special Dividend           7,800  
PaymentsOfDividendsAbstract              
Payments of Dividends, Common Stock   $ 12,500   $ 2,900 $ 37,403 16,550  
PaymentsOfDividendsPreferredStockAndPreferenceStock         0 $ 1,650  
Treasury Stock Line Items              
Stock Repurchase Prgram Authorized Amount   $ 100,000     $ 100,000    
Average Cost per share of Acquired Treasury Shares         $ 10.57    
Dividends              
Dividends And Shares Activitiy [Line Items]              
CommonStockDividendsPerShareDeclared $ 0.2           $ 0.3
ESPP [Member]              
Dividends And Shares Activitiy [Line Items]              
Stock Issued During Period Shares Employee Stock Purchase Plans         150 15  
Total Non cash compensation expense recognized         $ 185 $ 32