STOCKHOLDERS' EQUITY Cash Dividends (Details) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 31, 2019 Quarter $ / shares	Jun. 30, 2019 USD ($) $ / shares	Jun. 30, 2018 USD ($) $ / shares	Jun. 30, 2019 USD ($) $ / shares	Jun. 30, 2018 USD ($) $ / shares
Dividends Declared and Paid [Line Items]
Common Stock, Dividends, Number of Quarterly Distributions Declared, Current Fiscal Year | Quarter	4
Common Stock, Dividends, Per Share, Declared, Current Fiscal Year, First Quarter	$ 0.17
Common Stock, Dividends Per Share Declared, Current Fiscal Year, Second Quarter	0.17
Common Stock, Dividends Per Share Declared, Current Fiscal Year, Third Quarter	0.17
Common Stock, Dividends Per Share Declared, Current Fiscal Year, Fourth Quarter	$ 0.17
Payments of dividends to stockholders | $		$ 4,980	$ 4,705	$ 9,917	$ 9,480
Common Stock, Dividends, Per Share, Cash Paid		$ 0.17	$ 0.16	$ 0.34	$ 0.32