Acquisitions (Schedule Of Pro Forma Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Basic and diluted earnings per unit:
Income (Loss) from Continuing Operations, Per Outstanding Limited Partnership Unit, Basic, Net of Tax	$ 0.24	$ 3.38	$ 0.12	$ 0.21	$ 0.28	$ 0.33	$ 0.24	$ 0.34
Business Acquisition Pro Forma Earnings Per Unit Basic And Diluted									$ 3.91	$ 1.32	$ 0.86
Enterprise Offshore Acquisition [Member]
Pro forma earnings data:
Revenues from continuing operations									$ 2,421,989	$ 4,135,964	$ 4,372,827
Net income									$ 425,363	132,682	81,287
American Phoenix Acquisition [Member]
Pro forma earnings data:
Revenues from continuing operations										3,863,745	4,153,443
Net income										$ 111,132	90,829
Hornbeck Acquisition [Member]
Pro forma earnings data:
Revenues from continuing operations											4,177,715
Net income											$ 98,846