Consolidated Statement Of Partners' Capital - USD ($) $ in Thousands	Total	Limited Partner [Member]	Accumulated Other Comprehensive Loss [Member]
Balance at Dec. 31, 2012	$ 1,515,702	$ 1,550,760	$ (35,058)
Comprehensive income:
Net income	582,237	582,237
Total other comprehensive income	15,554		15,554
Total comprehensive income (loss)	597,791	582,237	15,554
Distributions	(475,461)	(475,461)
Equity-based incentive compensation expense	15,532	15,532
Issuance of limited partner units in settlement of equity-based incentive plan awards	6,404	6,404
Settlement of tax withholdings on equity-based incentive compensation	(12,259)	(12,259)
Other	(267)	(267)
Balance at Dec. 31, 2013	1,647,442	1,666,946	(19,504)
Comprehensive income:
Net income	839,519	839,519
Total other comprehensive income	(62,036)		(62,036)
Total comprehensive income (loss)	777,483	839,519	(62,036)
Distributions	(568,806)	(568,806)
Equity-based incentive compensation expense	19,963	19,963
Issuance of limited partner units in settlement of equity-based incentive plan awards	7,315	7,315
Settlement of tax withholdings on equity-based incentive compensation	(14,813)	(14,813)
Other	(351)	(351)
Balance at Dec. 31, 2014	1,868,233	1,949,773	(81,540)
Comprehensive income:
Net income	819,122	819,122
Total other comprehensive income	(14,810)		(14,810)
Total comprehensive income (loss)	804,312	819,122	(14,810)
Distributions	(662,948)	(662,948)
Equity-based incentive compensation expense	22,248	22,248
Issuance of limited partner units in settlement of equity-based incentive plan awards	8,045	8,045
Settlement of tax withholdings on equity-based incentive compensation	(17,784)	(17,784)
Other	(370)	(370)
Balance at Dec. 31, 2015	$ 2,021,736	$ 2,118,086	$ (96,350)