Cash Distributions and Earnings per Unit (Tables)

12 Months Ended

Dec. 31, 2014

CASH DISTRIBUTIONS AND EARNINGS PER UNIT [Abstract]

Schedule of incentive distributions made to General Partners or Unitholders by distribution

		Marginal Percentage Interest in Distributions
	Total Quarterly Distribution	Common	General
	Target Amount	Unitholders	Partner
Minimum Quarterly  Distribution	$0.35	98%	2%
First Target Distribution	up to $0.4025	98%	2%
Second Target Distribution	above $0.4025 up to $0.4375	85%	15%
Third Target Distribution	above $0.4375 up to $0.525	75%	25%
Thereafter	above $0.525	50%	50%

Schedule of earnings per unit, basic and diluted

	Year Ended			Year Ended			Year Ended
	December 31,			December 31,			December 31,
	2014			2013			2012
Net income	$	74,853		$	59,006		$	95,898
Earnings attributable to:
Common unit holders		71,225			55,949			93,566
Weighted average units outstanding (basic and diluted)
Common unit holders		76,587,656			66,317,588			58,008,617
Earnings per unit (basic and diluted):
Common unit holders	$	0.93		$	0.84		$	1.61
Earnings per unit — distributed (basic and diluted):
Common unit holders	$	1.79		$	1.82		$	1.79
Loss per unit — undistributed (basic and diluted):
Common unit holders	$	(0.86	)	$	(0.98	)	$	(0.18	)