STOCKHOLDERS' EQUITY Cash Dividends (Details) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended
	Oct. 31, 2019 quarters $ / shares	Jan. 31, 2019 Quarter $ / shares	Sep. 30, 2019 USD ($) $ / shares	Sep. 30, 2018 USD ($) $ / shares	Sep. 30, 2019 USD ($) $ / shares	Sep. 30, 2018 USD ($) $ / shares
Dividends Declared and Paid [Line Items]
Payments of dividends to stockholders | $			$ 4,999	$ 4,692	$ 14,916	$ 14,172
Common Stock, Dividends, Per Share, Cash Paid			$ 0.17	$ 0.16	$ 0.51	$ 0.48
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
Subsequent Event [Member]
Dividends Declared and Paid [Line Items]
Common Stock, Dividends, Number of Quarterly Distributions Declared | quarters	5
Common Stock, Dividends, Per Share, Declared, Additional, Current Fiscal Year, Fourth Quarter	$ 0.02
Common Stock, Dividends, Per Share, Declared, Next Fiscal Year, First Quarter	0.19
Common Stock, Dividends Per Share Declared, Next Fiscal Year, Second Quarter	0.19
Common Stock, Dividends Per Share Declared, Next Fiscal Year, Third Quarter	0.19
Common Stock, Dividends Per Share Declared, Next Fiscal Year, Fourth Quarter	$ 0.19