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Fixed Assets (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Cost | $ 170,190 | $ 168,706
Accumulated Depreciation | (118,119) | (115,792)
Net Book Value | 52,071 | 52,914
Computers, Furniture and Fixtures [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 109,252 | 111,356
Accumulated Depreciation | (83,383) | (83,537)
Net Book Value | 25,869 | 27,819
Leasehold Improvements [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 60,938 | 57,350
Accumulated Depreciation | (34,736) | (32,255)
Net Book Value | $ 26,202 | $ 25,095

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