COMMON STOCK REPURCHASES AND CASH DIVIDENDS Common Stock Repurchases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Stock Repurchased and Retired During Period, Value	$ 103,154	$ 9,188	$ 6,435
Common Stock [Member]
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount	$ 110,000	$ 30,000	$ 60,000
Stock Repurchased and Retired During Period, Shares	1,572,000	129,000	100,000
Stock Repurchased and Retired During Period, Value	$ 103,200	$ 9,200	$ 6,400
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 51,200