Statement of Partners' Capital (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net income	$ 54,401	$ 36,715	$ 96,480	$ 69,049
Other comprehensive income:
Foreign currency translation adjustment gain (loss), net of tax	(9,197)	368	(125)	4,340
Total other comprehensive income (loss)	(9,197)	368	(125)	4,340
Total comprehensive income	$ 45,204	$ 37,083	$ 96,355	$ 73,389