COMMON STOCK REPURCHASES AND CASH DIVIDENDS Cash Dividends (Details) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended
	Jan. 31, 2017 Quarter $ / shares	Jan. 31, 2016 $ / shares	Jun. 30, 2017 USD ($) $ / shares	Jun. 30, 2016 USD ($) $ / shares	Jun. 30, 2017 USD ($) $ / shares	Jun. 30, 2016 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	$ 0.14
Common Stock, Dividends Per Share Declared, Current Fiscal Year, Second Quarter		$ 0.14
Common Stock, Dividends Per Share Declared, Current Fiscal Year, Third Quarter		0.14
Common Stock, Dividends Per Share Declared, Current Fiscal Year, Fourth Quarter		$ 0.14
Payments of Dividends | $			$ 4,162	$ 3,754	$ 8,299	$ 7,483
Common Stock, Dividends, Per Share, Cash Paid			$ 0.14	$ 0.13	$ 0.28	$ 0.26