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Partners' Capital - Cash Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands						12 Months Ended
	Feb. 14, 2019	Jan. 17, 2019	Nov. 09, 2018	Aug. 10, 2018	May 11, 2018	Dec. 31, 2018
Cash Distributions
Distribution per Limited Partner Unit (in dollars per share)			$ 0.525	$ 0.525	$ 0.525	$ 1.575
Total Distribution			$ 47,700	$ 47,600	$ 47,600	$ 142,900
Non-cash distributions						$ 645
Number of common units issued under DRIP						39,280
Cash Distributions
Cash Distributions
Non-cash distributions						$ 600
Phantom Unitholders | Cash Distributions
Cash Distributions
Total Distribution			500	400	400	$ 1,300
Limited partner | Common and Subordinated Units | Cash Distributions
Cash Distributions
Distribution per Limited Partner Unit (in dollars per share)	$ 0.525
Cash distribution announced per unit (in dollars per share)		$ 0.525
Limited partner | Common units
Cash Distributions
Limited partner units issued (in shares)						89,984
Limited partner | Common units | Cash Distributions
Cash Distributions
Total Distribution			$ 47,200	$ 47,200	$ 47,200	$ 141,600

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Amount of cash distribution paid to unit-holder of limited liability company (LLC).

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Per unit of ownership amount of cash distributions declared to unit-holder of a limited partnership (LP).

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