PER SHARE DATA (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Income available to common shareholders	$ 34,692	$ 39,713	$ 57,241	$ 71,979
Income available to common shareholders plus assumed exercise of all outstanding share-based awards	$ 34,692	$ 39,713	$ 57,241	$ 71,979
Income available to common shareholders (in shares)	94,461,000	96,626,000	94,415,000	96,493,000
Effect of dilutive share-based awards (in shares)	234,000	332,000	229,000	329,000
Income available to common shareholders plus assumed exercise all outstanding share-based awards (in shares)	94,695,000	96,958,000	94,644,000	96,822,000
Income available to common shareholders (in dollars per share)	$ 0.37	$ 0.41	$ 0.61	$ 0.75
Income available to common shareholders plus assumed exercise all outstanding share-based awards (in dollars per share)	$ 0.37	$ 0.41	$ 0.60	$ 0.74
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from diluted shares (in shares)	37,800		51,300	32,400
Weighted average exercise price of antidilutive securities (in dollars per share)	$ 24.59		$ 24.78	$ 25.31
Other Equity Awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from diluted shares (in shares)	14,000	12,000	7,000	6,000