v2.4.0.8
EARNINGS PER SHARE (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
EARNINGS PER SHARE [Abstract]      
Weighted-average anti-dilutive stock options outstanding (in shares) 40,000 500,000  
Basic earnings per share [Abstract]      
Net income $ 22,173 $ 20,241  
Income attributable to unvested stock-based compensation awards (99) (79)  
Income available to common shareholders 22,074 20,162  
Weighted-average common shares outstanding - basic (in shares) 40,458,000 39,703,000  
Basic earnings per share (in dollars per share) $ 0.55 $ 0.51  
Diluted earnings per share [Abstract]      
Net income 22,173 20,241  
Income attributable to unvested stock-based compensation awards (99) (79)  
Income available to common shareholders $ 22,074 $ 20,162  
Weighted-average common shares outstanding (in shares) 40,458,000 39,703,000  
Assumed exercise of stock options (in shares) 512,000 463,000  
Weighted-average shares - diluted (in shares) 40,970,000 40,166,000  
Diluted earnings per share (in dollars per share) $ 0.54 $ 0.50  
Stock Repurchase Program [Abstract]      
Number of common shares authorized to be repurchased (in shares)     2,000,000
Number of common shares repurchased (in shares) 0   0