Goodwill and Other Intangible Assets (Details Textual) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	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