EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Basic and diluted net earnings per share
Net earnings applicable to common shareholders	$ 10,752	$ 9,183	$ 18,959	$ 12,008
Weighted average shares outstanding - basic	73,651,858	72,283,896	73,379,507	72,138,686
Effect of dilutive securities - restricted stock		11,822		15,592
Effect of dilutive securities - stock options	252,246	557,159	178,843	569,175
Weighted average shares outstanding - diluted	73,904,104	72,852,877	73,558,350	72,723,453
Basic net earnings per share (in dollars per share)	$ 0.15	$ 0.13	$ 0.26	$ 0.17
Diluted net earnings per share (in dollars per share)	$ 0.15	$ 0.13	$ 0.26	$ 0.17
Convertible bonds and preferred stock
Earnings per share
Anti-dilutive securities (in shares)			38,072	38,072
Stock options and restricted stock
Earnings per share
Anti-dilutive securities (in shares)			2,392,313	2,794,021
Convertible debentures
Earnings per share
Percentage of principal amount at which debentures may be converted from the date of issuance until maturity into common stock			100.00%
Conversion price (in dollars per share)	$ 50		$ 50