EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Basic and diluted net earnings per share
Net earnings (loss) applicable to common shareholders	$ (102,274)	$ 8,207
Weighted average shares outstanding - basic	80,869,169	73,104,129
Effect of dilutive securities - stock options		111,711
Weighted average shares outstanding - diluted	80,869,169	73,215,840
Basic net earnings (loss) per share (in dollars per share)	$ (1.26)us-gaap_EarningsPerShareBasic	$ 0.11us-gaap_EarningsPerShareBasic
Diluted net earnings (loss) per share (in dollars per share)	$ (1.26)us-gaap_EarningsPerShareDiluted	$ 0.11us-gaap_EarningsPerShareDiluted
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)	4,267,649	2,635,977
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

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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