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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, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
NET LOSS PER COMMON SHARE        
Nonvested shares outstanding 1,229,646   1,229,646  
Anti-dilutive shares     1,229,646  
Common shares outstanding, basic:        
Weighted average common shares outstanding - Basic 43,196,895 42,878,228 43,179,300 40,484,409
Common shares outstanding, diluted:        
Weighted average common shares outstanding - Basic 43,196,895 42,878,228 43,179,300 40,484,409
Weighted average common shares outstanding, diluted 43,196,895 42,878,228 43,179,300 40,484,409
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 $ (45,369) $ (27,741) $ (93,532) $ (60,840)
Net loss attributable to GS&T for the computation of diluted net loss per share $ (45,369) $ (27,741) $ (93,532) $ (60,840)