Condensed Consolidated Statements Of Partners' Capital (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Partners' capital, January 1, units	88,690,985	81,203,000
Partners' capital, January 1, value	$ 1,097,737	$ 916,495
Net income	50,923	49,748
Cash distributions	96,236	79,795
Partners' Capital Account, Exchanges and Conversions	0	0
Partners' capital, June 30, units	88,690,985	82,941,000
Partners' capital, June 30, value	$ 1,052,424	$ 886,448
Number Of Common Units [Member]
Partners' Capital Account, Units, Converted	0	1,738,000