PER SHARE DATA (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from diluted shares (in shares)	907		69
Weighted average exercise price of antidilutive securities (in dollars per share)	$ 23.43	$ 23.42	$ 24.89	$ 23.40
Income (Numerator) [Abstract]
Income available to common shareholders	$ 28,778,000.000	$ 24,857,000.000	$ 88,090,000.000	$ 66,417,000.000
Income available to common shareholders plus assumed exercise of all outstanding share based awards	$ 28,778,000.000	$ 24,857,000.000	$ 88,090,000.000	$ 66,417,000.000
Shares (Denominator) [Abstract]
Income available to common shareholders (in shares)	96,052	95,201	95,906	94,991
Effect of dilutive share-based awards (in shares)	322	318	327	236
Income available to common shareholders plus assumed exercise all outstanding share-based awards (in shares)	96,374	95,519	96,233	95,227
Per share amount [Abstract]
Income available to common shareholders (in dollars per share)	$ 0.30	$ 0.26	$ 0.92	$ 0.70
Income available to common shareholders plus assumed exercise all outstanding share-based awards (in dollars per share)	$ 0.30	$ 0.26	$ 0.92	$ 0.70
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from diluted shares (in shares)	907	1,600		1,800