EARNINGS PER COMMON SHARE - Computation of Basic and Diluted Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Numerator for basic and diluted earnings per share -income available to common shareholders:
Net income	$ 15,104	$ 13,824
Denominator for basic earnings per share - weighted average shares	57,091,604	57,439,029
Effect of dilutive securities -
Employee stock awards	591,659	744,503
Warrants	144,916	99,935
Denominator for diluted earnings per share - adjusted weighted average shares	57,828,179	58,283,467
Basic	$ 0.26	$ 0.24
Diluted	$ 0.26	$ 0.24

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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- Definition

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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