EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
EARNINGS PER SHARE
Net income	$ 14,267	$ 10,812	$ 151,576	$ 24,290
Weighted average shares outstanding - basic	41,957,000	41,717,000	41,886,000	41,674,000
Dilutive effect of Treasury warrants (in shares)	25,000	20,000	28,000	21,000
Weighted average shares outstanding - diluted	42,320,000	41,959,000	42,235,000	41,959,000
Basic earnings per share (in dollars per share)	$ 0.34	$ 0.26	$ 3.62	$ 0.58
Diluted earnings per share (in dollars per share)	$ 0.34	$ 0.26	$ 3.59	$ 0.58
Antidilutive securities excluded from the dilutive share calculation (in shares)	26,256	345,125	26,256	345,125
Employee stock options and awards
SHARE-BASED COMPENSATION
Dilutive effect of share-based compensation arrangements	338,000	155,000	318,000	201,000
Deferred salary restricted stock units
SHARE-BASED COMPENSATION
Dilutive effect of share-based compensation arrangements		67,000	3,000	63,000

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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