Acquisitions (Recognized Identified Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands	Aug. 31, 2016	Aug. 31, 2014	Sep. 30, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Current assets		$ 1,435,935
Property and equipment		1,093,893
Goodwill		1,289,398	$ 3,236,398	$ 3,111,262
Intangible assets		476,405
Other noncurrent assets		2,238
Current liabilities		(787,768)
Other noncurrent liabilities		(346,829)
Net assets		3,163,272
Net deemed contribution		(188,272)
Cash acquired		(24,276)
Total cash consideration, net of cash acquired		2,950,724
Susser [Member]
Business Acquisition [Line Items]
Current assets		217,244
Property and equipment		983,900
Goodwill		976,631
Intangible assets		541,054
Other noncurrent assets		38,216
Current liabilities		(246,009)
Other noncurrent liabilities		(842,310)
Net assets		1,668,726
Net deemed contribution		(701,871)
Cash acquired		(63,801)
Total cash consideration, net of cash acquired		903,054
Emerge Energy Services LP [Member]
Business Acquisition [Line Items]
Current assets	$ 26,347
Property and equipment	60,044
Goodwill	78,278
Intangible assets	22,678
Other noncurrent assets	41
Current liabilities	(15,875)
Net assets	171,513
Cash acquired	(172)
Total cash consideration, net of cash acquired	$ 171,341
Sunoco LLC [Member]
Business Acquisition [Line Items]
Current assets		1,107,007
Property and equipment		384,100
Goodwill		0
Intangible assets		182,477
Other noncurrent assets		2,238
Current liabilities		(641,400)
Other noncurrent liabilities		(7,293)
Net assets		1,027,129
Sunoco Retail LLC [Member]
Business Acquisition [Line Items]
Current assets		328,928
Property and equipment		709,793
Goodwill		1,289,398
Intangible assets		293,928
Other noncurrent assets		0
Current liabilities		(146,368)
Other noncurrent liabilities		(339,536)
Net assets		$ 2,136,143