SHAREHOLDER'S EQUITY (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Dividends And Shares Activitiy [Line Items]
Dvidend Equivalent liability - short term	$ 992		$ 992		$ 830
Dvidend Equivalent liability - long term	721		721		1,331
Total Dividend Equivalent Liability	$ 1,713		1,713		2,161
Dividend payments			24,916	$ 5,837
Amount recorded as financing activity			(5,172)	(2,503)	(2,565)
The total cost to repurchase			$ (19,379)		(10,675)
Dividends paid on preferred stock					2,574
Employee stock purchase plan, authorized shares	1,000		1,000
Stock Issued During Period Value Employee Stock Purchase Plan			$ 709		$ 182
Total Non cash compensation expense recognized	$ 2,951	$ 982	$ 6,055	2,067
Espp Shares Market Value	85.00%		85.00%
Espp Share Discount	15.00%		15.00%
PaymentsOfDividendsAbstract
Payments of Dividends, Common Stock			$ 24,916	5,837
PaymentsOfDividendsPreferredStockAndPreferenceStock			0	$ 1,100
Treasury Stock Line Items
Stock Repurchase Prgram Authorized Amount	$ 100,000		$ 100,000
Average Cost per share of Acquired Treasury Shares			$ 10.57
ESPP [Member]
Dividends And Shares Activitiy [Line Items]
Stock Issued During Period Shares Employee Stock Purchase Plans			100	15
Total Non cash compensation expense recognized			$ 125	$ 32