Consolidated Statements of Changes in Partners' Equity Parenthetical - $ / shares	3 Months Ended				12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash distributions declared per common unit	$ 0.4225	$ 0.4125	$ 0.4025	$ 0.3925	$ 1.6300	$ 1.4275	$ 1.1632