PER SHARE DATA (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income (Numerator) [Abstract]
Income available to common shareholders	$ 22,549	$ 32,266
Income available to common shareholders plus assumed exercise of all outstanding share based awards	$ 22,549	$ 32,266
Shares (Denominator) [Abstract]
Income available to common shareholders (in shares)	94,369,000	96,360,000
Effect of dilutive share-based awards (in shares)	225,000	293,000
Income available to common shareholders plus assumed exercise all outstanding share-based awards (in shares)	94,594,000	96,653,000
Per share amount [Abstract]
Income available to common shareholders (in dollars per share)	$ 0.24	$ 0.33
Income available to common shareholders plus assumed exercise all outstanding share-based awards (in dollars per share)	$ 0.24	$ 0.33
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from diluted shares (in shares)	169,100	670,000
Weighted average exercise price of antidilutive securities (in dollars per share)	$ 23.35	$ 24.89
Other Equity Awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from diluted shares (in shares)	32,200	79,000