EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Basic and diluted net earnings per share
Net earnings (loss) applicable to common shareholders	$ (85,278)	$ 10,752	$ (187,552)	$ 18,959
Weighted average shares outstanding - basic	81,202,007	73,651,858	81,036,508	73,379,507
Effect of dilutive securities - stock options		252,246		178,843
Weighted average shares outstanding - diluted	81,202,007	73,904,104	81,036,508	73,558,350
Basic net earnings (loss) per share (in dollars per share)	$ (1.05)	$ 0.15	$ (2.31)	$ 0.26
Diluted net earnings (loss) per share (in dollars per share)	(1.05)	$ 0.15	$ (2.31)	$ 0.26
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)			4,116,304	2,392,313
Secured 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