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NET LOSS PER COMMON SHARE (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
NET LOSS PER COMMON SHARE        
Nonvested shares outstanding 880,465   880,465  
Anti-dilutive shares (in shares)     880,465  
Common shares outstanding, basic:        
Weighted-average common shares outstanding, basic (in shares) 43,568,942 43,196,895 43,568,942 43,179,300
Common shares outstanding, diluted:        
Weighted-average common shares outstanding, basic (in shares) 43,568,942 43,196,895 43,568,942 43,179,300
Weighted-average common shares outstanding, diluted (in shares) 43,568,942 43,196,895 43,568,942 43,179,300
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 $ (60,524) $ (45,369) $ (99,630) $ (93,532)
Net loss attributable to GS&T for the computation of diluted net loss per share $ (60,524) $ (45,369) $ (99,630) $ (93,532)