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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

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

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-Publisher SEC

-Name Regulation S-X (SX)

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X

- Definition

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229



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