Partners' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Capital Unit [Line Items]
Partners' capital account, units held by controlling interest	22,380,030	22,380,030
General partner ownership interest		2.00%
Ownership percentage, controlling interest	37.00%	37.00%
Partners' Capital Account, Units, Sold in Private Placement	3,420,000
Sale of Stock, Price Per Share	$ 30.18	$ 30.18
Proceeds from Issuance of Private Placement	$ 103,000	$ 103,000
Contribution from general partner	$ 2,100	2,577	$ 128,476	$ 120,111
Common Unit Issuance Program		$ 200,000
Common Unit, Issued	703,455	703,455
Proceeds from Issuance of Common Limited Partners Units		$ 23,500
Fees and Commissions		500
General Partners' Contributed Capital	$ 500	$ 500