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NET (LOSS) INCOME PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
NET (LOSS) INCOME PER SHARE [Abstract] |  |  |  |  |  |  |  |  |  |  |
Anti-dilutive shares (in shares) |  |  |  |  |  |  |  |  | 880,465 |  |
Common shares outstanding, basic [Abstract] |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding, basic (in shares) | 43,403,894 | 43,231,510 | 43,196,895 | 43,161,510 | 43,026,657 | 42,885,810 | 42,878,228 | 38,090,590 | 43,249,070 | 41,727,075 | 35,179,244
Common shares outstanding, diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding, basic (in shares) | 43,403,894 | 43,231,510 | 43,196,895 | 43,161,510 | 43,026,657 | 42,885,810 | 42,878,228 | 38,090,590 | 43,249,070 | 41,727,075 | 35,179,244
Dilutive effect of convertible notes (in shares) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Dilutive effect of restricted stock awards (in shares) |  |  |  |  |  |  |  |  | 0 | 0 | 78,961
Weighted-average common shares outstanding, diluted (in shares) | 43,403,894 | 43,231,510 | 43,196,895 | 43,161,510 | 43,026,657 | 42,885,810 | 42,878,228 | 38,090,590 | 43,249,070 | 41,727,075 | 35,258,205
Reconciliation of net (loss) attributable to GS&T and net (loss) income attributable to GS&T for diluted net (loss) income per share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net (loss) income attributable to GS&T | $ (19,175) | $ (35,034) | $ (45,369) | $ (48,163) | $ (45,667) | $ (38,449) | $ (27,741) | $ (33,071) | $ (147,741) | $ (144,928) | $ 25,386
Interest expense related to convertible notes, if dilutive |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net (loss) income attributable to GS&T for the computation of diluted net (loss) income per share |  |  |  |  |  |  |  |  | $ (147,741) | $ (144,928) | $ 25,386

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