Consolidated Statements of Changes in Partners' Equity (Parenthetical) (Parentheticals) (USD $)	3 Months Ended					12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Statement of Stockholders' Equity [Abstract]
Cash distributions declared per common unit	$ 0.3175	$ 0.3075	$ 0.2975	$ 0.2407	$ 0	$ 1.1632	$ 0