PER SHARE DATA (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income (Numerator) [Abstract]
Income available to common shareholders	$ 24,857	$ 23,825	$ 66,417	$ 67,315
Income available to common shareholders plus assumed exercise of all outstanding share based awards	$ 24,857	$ 23,825	$ 66,417	$ 67,315
Shares (Denominator) [Abstract]
Income available to common shareholders (in shares)	95,201	94,438	94,991	93,534
Effect of dilutive share-based awards (in shares)	318	91	236	79
Income available to common shareholders plus assumed exercise all outstanding share-based awards (in shares)	95,519	94,529	95,227	93,613
Per share amount [Abstract]
Income available to common shareholders (in dollars per share)	$ 0.26	$ 0.25	$ 0.70	$ 0.72
Income available to common shareholders plus assumed exercise all outstanding share-based awards (in dollars per share)	$ 0.26	$ 0.25	$ 0.70	$ 0.72
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from diluted shares (in shares)	1,600	2,900	1,800
Weighted average exercise price of antidilutive securities (in dollars per share)	$ 23.42	$ 20.59	$ 23.40	$ 20.67
Other Equity Awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from diluted shares (in shares)		50		17