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NET LOSS PER COMMON SHARE (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
NET LOSS PER COMMON SHARE [Abstract]        
Nonvested shares outstanding (in shares) 1,217,896   1,217,896  
Anti-dilutive shares (in shares)     1,217,896  
Common shares outstanding, basic:        
Weighted average common shares outstanding-basic (in shares) 43,231,510 42,885,810 43,196,895 41,290,719
Common shares outstanding, diluted:        
Dilutive effect of convertible notes (in shares) 0 0 0 0
Dilutive effect of restricted stock awards (in shares) 0 0 0 0
Weighted average common shares outstanding-diluted (in shares) 43,231,510 42,885,810 43,196,895 41,290,719
Reconciliation of the net loss attributable to GS&T and the net loss attributable to GS&T for diluted net loss per share [Abstract]        
Net loss attributable to GS&T $ (35,034) $ (38,449) $ (128,566) $ (99,289)
Interest expense related to convertible notes, if dilutive 0 0 0 0
Net loss attributable to GS&T for the computation of diluted net loss per share $ (35,034) $ (38,449) $ (128,566) $ (99,289)