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Long Term Incentive Plan 1 (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Cost of share-based compensation charged to general and administrative expense	$ 2,272	$ 1,367	$ 6,746	$ 4,753
Cost of share-based compensation charged to operating expense	310	205	949	935
Total amount charged to income	2,582	1,572	7,695	5,688
Non Controlling Partners Interest In Share Based Compensation	1,338	638	4,054	2,310
Amount of related income tax benefit recognized in income	$ 459	$ 347	$ 1,347	$ 1,252

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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