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SALE OF COALOGIX (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Working capital escrow deposit |  | $ 347 |
Proceeds to buyers from the sale of 100% of CoaLogix |  | 101,000 |
Sale of Stock, Percentage of Ownership before Transaction |  | 65.00% |
Proceeds from the sale of CoaLogix |  | 61,915 |
Escrow deposit for indemnification claims |  | 5,961 |
Release of escrow deposits | 5,961 | 347 | 0
Total gain on sale of CoaLogix before taxes |  | 46,974 |
Working capital adjustment |  | 485 |
Tax expense on sale of CoaLogix |  | 15,971 |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate | 34.00% | 34.00% | 34.00%
Net gain after tax on sale of CoaLogix |  | 31,003 |
Tax benefit recorded with respect to gain on sale of CoaLogix |  | $ 14,571 |

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