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Certain provisions of the partnership agreement (Details 2) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]
Weighted Average Number Of Diluted Shares Outstanding	47,366	47,140	47,361	47,108

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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