EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Basic and diluted net earnings (loss) per share
Net earnings (loss) applicable to common shareholders	$ (186,063)	$ 3,723	$ (373,616)	$ 22,682
Weighted average shares outstanding - basic	81,203,466	78,549,255	81,092,772	75,121,693
Effect of dilutive securities - restricted stock		12,524
Effect of dilutive securities - stock options		312,440		192,473
Weighted average shares outstanding - diluted	81,203,466	78,874,219	81,092,772	75,314,166
Basic net earnings (loss) per share (in dollars per share)	$ (2.29)	$ 0.05	$ (4.61)	$ 0.30
Diluted net earnings (loss) per share (in dollars per share)	(2.29)	$ 0.05	$ (4.61)	$ 0.30
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)			3,989,690	2,322,263
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