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PER SHARE DATA (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Income available to common shareholders $ 38,093 $ 22,549
Income available to common shareholders plus assumed exercise of all outstanding share-based awards $ 38,093 $ 22,549
Income available to common shareholders (in shares) 93,643,000 94,369,000
Effect of dilutive share-based awards (in shares) 186,000 225,000
Income available to common shareholders plus assumed exercise all outstanding share-based awards (in shares) 93,829,000 94,594,000
Income available to common shareholders (in dollars per share) $ 0.41 $ 0.24
Income available to common shareholders plus assumed exercise all outstanding share-based awards (in dollars per share) $ 0.41 $ 0.24
Stock Options [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from diluted shares (in shares)   169,100
Weighted average exercise price of antidilutive securities (in dollars per share)   $ 23.35
Other Equity Awards [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from diluted shares (in shares) 26,700 32,200