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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)