COMMON STOCK REPURCHASES AND CASH DIVIDENDS Cash Dividends (Details) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended												12 Months Ended
	Oct. 31, 2019 quarters $ / shares	Jan. 31, 2019 $ / shares	Dec. 31, 2019 $ / shares	Sep. 30, 2019 $ / shares	Jun. 30, 2019 $ / shares	Mar. 31, 2019 $ / shares	Dec. 31, 2018 $ / shares	Sep. 30, 2018 $ / shares	Jun. 30, 2018 $ / shares	Mar. 31, 2018 $ / shares	Dec. 31, 2017 $ / shares	Sep. 30, 2017 $ / shares	Jun. 30, 2017 $ / shares	Mar. 31, 2017 $ / shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Dividends Declared and Paid [Line Items]
Common Stock, Dividends, Per Share, Declared			$ 0.19	$ 0.17	$ 0.17	$ 0.17	$ 0.16	$ 0.16	$ 0.16	$ 0.16	$ 0.14	$ 0.14	$ 0.14	$ 0.14
Payments of Dividends | $															$ 20,506	$ 18,823	$ 16,634
Common Stock, Dividends, Per Share, Declared, Current Fiscal Year, Each Quarter		$ 0.17
Common Stock, Dividends, Number of Distributions Declared | quarters	5
Additional Common Stock, Dividends, Per Share, Declared, Current Fiscal Year, Fourth Quarter	$ 0.02
Common Stock, Dividends Per Share Declared, Current Fiscal Year, Fourth Quarter		$ 0.17
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