PER SHARE DATA (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Income available to common shareholders	$ 37,817	$ 34,343	$ 95,058	$ 106,322
Income available to common shareholders plus assumed exercise of all outstanding share-based awards	$ 37,817	$ 34,343	$ 95,058	$ 106,322
Income available to common shareholders (in shares)	94,304,000	96,203,000	94,378,000	96,396,000
Effect of dilutive share-based awards (in shares)	260,000	265,000	239,000	308,000
Income available to common shareholders plus assumed exercise all outstanding share-based awards (in shares)	94,564,000	96,468,000	94,617,000	96,704,000
Income available to common shareholders (in dollars per share)	$ 0.40	$ 0.36	$ 1.01	$ 1.10
Income available to common shareholders plus assumed exercise all outstanding share-based awards (in dollars per share)	$ 0.40	$ 0.36	$ 1.00	$ 1.10
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from diluted shares (in shares)	32,400	32,400	45,000	32,400
Weighted average exercise price of antidilutive securities (in dollars per share)	$ 24.47		$ 24.71	$ 25.31