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NET (LOSS) INCOME PER COMMON SHARE (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
NET (LOSS) INCOME PER COMMON SHARE        
Nonvested shares outstanding 935,287   935,287  
Anti-dilutive shares     935,287  
Common shares outstanding, basic:        
Weighted average common shares outstanding-basic 42,885,810 35,157,110 41,290,719 35,149,912
Common shares outstanding, diluted:        
Weighted average common shares outstanding-basic 42,885,810 35,157,110 41,290,719 35,149,912
Dilutive effect of restricted stock awards (in shares)   55,730   62,129
Weighted average common shares outstanding-diluted 42,885,810 35,212,840 41,290,719 35,212,041
Reconciliation of the net (loss) income attributable to GS&T and the net income attributable to GS&T for diluted earnings per share        
Net (loss) income attributable to GS&T $ (38,449) $ 1,562 $ (99,289) $ 25,080
Net (loss) income attributable to GS&T for the computation of diluted net (loss) income per share $ (38,449) $ 1,562 $ (99,289) $ 25,080