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NET LOSS PER COMMON SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
NET LOSS PER COMMON SHARE |  |
Anti-dilutive shares (in shares) | 880,465 |
Common shares outstanding, basic: |  |
Weighted-average common shares outstanding, basic (in shares) | 43,568,942 | 43,161,510
Common shares outstanding, diluted: |  |
Weighted-average common shares outstanding, basic (in shares) | 43,568,942 | 43,161,510
Weighted-average common shares outstanding, diluted (in shares) | 43,568,942 | 43,161,510
Reconciliation of the net loss attributable to GS&T and the net loss attributable to GS&T for diluted net loss per share |  |
Net loss attributable to GS&T | $ (39,105) | $ (48,163)
Net loss attributable to GS&T for the computation of diluted net loss per share | $ (39,105) | $ (48,163)

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