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Significant Accounting Policies (Share-Based Compensation Expense Schedule) (Details Textuals) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Cost of share-based compensation charged to general and administrative expense	$ 8,240	$ 6,405	$ 8,246
Cost of share-based compensation charged to operating expense	1,243	1,151	1,323
Total amount charged to income	9,483	7,556	9,569
Interest of non-controlling partners in share-based compensation	3,813	3,052	3,900
Amount of related income tax benefit recognized in income	$ 2,102	$ 1,670	$ 2,038

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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