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Goodwill and Other Intangible Assets (Details Textual) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Jun. 30, 2011
Schedule of Goodwill (Textuals) |
Number of Domestic Regions of Operation of Reporting Unit | 16
Number Of International Countries Of Operation Of Reporting Unit | 8
Basis of determination fair value of impaired goodwill | Multiple of cash flows, which was six and a half times for the evaluation performed
Carrying value of intangible assets written off | $ 549
US Domestic Operating Segment Member |
Schedule of Goodwill (Textuals) |
Accumulated impairment losses | 214,031
International Operating Segment [Member] |
Schedule of Goodwill (Textuals) |
Accumulated impairment losses | $ 27,622

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