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Debt Guarantees (Details) | 9 Months Ended |  |  | 9 Months Ended | 0 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2013 USD ($) guarantee | Sep. 30, 2013 ZAR | Sep. 30, 2013 CAD | Dec. 31, 2012 USD ($) | Sep. 30, 2013 Geo Amey USD ($) | Sep. 30, 2013 Geo Amey GBP (£) | Oct. 03, 2013 Bank of England [Member] Geo Amey
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Working Capital Line of Credit Issued to GEO Amey |  |  |  |  | $ 19,400,000 | £ 12,000,000 |
Remaining Guarantee under Letter of Credit | 3,500,000 | 34,800,000 |  |  |  |  |
Maximum Loan Amount under Stand by Facility | 1,987,600.0 | 20,000,000 |  |  |  |  |
Potential Estimated Exposure of tax obligations | 2,400,000 |  | 2,500,000 |  |  |  |
Liability Related to Potential Tax Exposure | 2,200,000 |  |  | 2,000,000 |  |  |
Number of letters of guarantee outstanding under separate international facilities relating to performance guarantees | 8 | 8 |  |  |  |  |
Letters of Guarantee Outstanding Relating to Performance Guarantees | 11,300,000 |  |  |  |  |  |
Ownership percentage in South African Custodial Services Pty. Limited |  |  |  |  | 50.00% | 50.00% |
Due from Affiliate, Noncurrent |  |  |  |  | 20,500,000 | 12,700,000 |
Line of Credit Facility, Increase, Accrued Interest |  |  |  |  | $ 1,200,000 |  |
Basis spread on variable rate |  |  |  |  |  |  | 0.50%

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