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Net Income Per Unit (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	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
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to partners	$ 18,819	$ 12,265	$ 10,975	$ 10,933	$ 8,528	$ 52,992	$ 8,528
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic						(444)	8,528
Weighted Average Number of Shares Outstanding, Basic	23,795	22,811	22,811	22,811	22,811
Weighted Average Number of Shares Outstanding, Diluted	23,861	22,883	22,861	22,815	22,813
Weighted Average Number of Shares Outstanding, Basic and Diluted	22,811	22,811	22,811	22,811	22,811
Earnings Per Share, Basic	$ 0.40us-gaap_EarningsPerShareBasic	$ 0.27us-gaap_EarningsPerShareBasic	$ 0.24us-gaap_EarningsPerShareBasic	$ 0.24us-gaap_EarningsPerShareBasic	$ 0.19us-gaap_EarningsPerShareBasic
Earnings Per Share, Diluted	$ 0.40us-gaap_EarningsPerShareDiluted	$ 0.27us-gaap_EarningsPerShareDiluted	$ 0.24us-gaap_EarningsPerShareDiluted	$ 0.24us-gaap_EarningsPerShareDiluted	$ 0.19us-gaap_EarningsPerShareDiluted
Earnings Per Share, Basic and Diluted	$ 0.40us-gaap_EarningsPerShareBasicAndDiluted	$ 0.27us-gaap_EarningsPerShareBasicAndDiluted	$ 0.24us-gaap_EarningsPerShareBasicAndDiluted	$ 0.24us-gaap_EarningsPerShareBasicAndDiluted	$ 0.19us-gaap_EarningsPerShareBasicAndDiluted
Subordinated Units [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Distribution Made to Limited Partner, Cash Distributions Declared						26,534	0
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic						(221)	4,264
Participating Securities, Distributed and Undistributed Earnings (Loss), Basic						26,313	4,264
Weighted Average Number of Shares Outstanding, Basic and Diluted						22,811	22,811
Earnings Per Share, Basic and Diluted						$ 1.15	$ 0.19
Common Units [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Distribution Made to Limited Partner, Cash Distributions Declared						26,902	0
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic						(223)	4,264
Participating Securities, Distributed and Undistributed Earnings (Loss), Basic						$ 26,679	$ 4,264
Weighted Average Number of Shares Outstanding, Basic						23,059	22,811
Weighted Average Number of Shares Outstanding, Diluted						23,107	22,813
Earnings Per Share, Basic						$ 1.16	$ 0.19
Earnings Per Share, Diluted						$ 1.15	$ 0.19