Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CONSOLIDATED STATEMENTS OF INCOME [Abstract]
Time charter and voyage revenues (includes related party revenue of $27,444, $23,738 and $7,357 for the years ended December 31, 2014, 2013 and 2012, respectively)	$ 227,356us-gaap_Revenues	$ 198,159us-gaap_Revenues	$ 205,435us-gaap_Revenues
Time charter and voyage expenses	(15,390)us-gaap_CostOfRevenue	(14,943)us-gaap_CostOfRevenue	(12,937)us-gaap_CostOfRevenue
Direct vessel expenses	(761)us-gaap_DirectOperatingCosts	0us-gaap_DirectOperatingCosts	(25)us-gaap_DirectOperatingCosts
Management fees (entirely through related parties transactions)	(50,359)	(36,173)	(31,689)
General and administrative expenses	(7,839)us-gaap_GeneralAndAdministrativeExpense	(6,305)us-gaap_GeneralAndAdministrativeExpense	(5,555)us-gaap_GeneralAndAdministrativeExpense
Depreciation and amortization	(95,822)us-gaap_DepreciationAndAmortization	(77,505)us-gaap_DepreciationAndAmortization	(71,622)us-gaap_DepreciationAndAmortization
Interest expense and finance cost, net	(28,761)us-gaap_InterestAndDebtExpense	(16,910)us-gaap_InterestAndDebtExpense	(10,127)us-gaap_InterestAndDebtExpense
Interest income	243us-gaap_InvestmentIncomeNet	50us-gaap_InvestmentIncomeNet	229us-gaap_InvestmentIncomeNet
Other income	47,935us-gaap_OtherIncome	13,730us-gaap_OtherIncome	22,598us-gaap_OtherIncome
Other expense	(1,749)us-gaap_OtherExpenses	(1,097)us-gaap_OtherExpenses	(409)us-gaap_OtherExpenses
Net income	$ 74,853us-gaap_NetIncomeLoss	$ 59,006us-gaap_NetIncomeLoss	$ 95,898us-gaap_NetIncomeLoss
Weighted average units outstanding (basic and diluted)
Common unit holders	76,587,656	66,317,588	58,008,617
Earnings per unit (see Note 19):
Common unit (basic and diluted)	$ 0.93	$ 0.84	$ 1.61

Net income (loss) allocated to each outstanding common unit basic and diluted.

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