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EARNINGS PER SHARE - Antidilutive securities excluded from the computation of earnings per share (Details) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Class of Stock [Line Items]
Shares excluded from diluted shares calculation	1,607	2,071
Convertible securities
Class of Stock [Line Items]
Shares excluded from diluted shares calculation	828	1,093
Restricted stock units, stock options and SARs
Class of Stock [Line Items]
Shares excluded from diluted shares calculation	779	978

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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