Income (Loss) Per Common Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Earnings per unit
Net (Loss) Income									$ (187,097)	$ 50,193	$ 48,758
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ (206,985)	$ 50,995	$ (6,100)	$ (25,007)	$ 105,409	$ (3,077)	$ (13,576)	$ (38,563)	(187,097)	50,193	48,758
Less: Net income attributable to noncontrolling interest	2,853	(6,838)	(3,497)	(4,350)	(3,630)	(5,751)	(3,416)	(90)	(11,832)	(12,887)	(1,103)
Net (loss) income attributable to parent equity									(198,929)	37,306	47,655
LESS: NET INCOME ALLOCATED TO GENERAL PARTNER	178	(16,239)	(16,185)	(15,374)	(13,474)	(11,785)	(11,059)	(9,382)	(47,620)	(45,700)	(14,148)
Less: Net income allocated to limited partners	$ (203,954)	$ 27,918	$ (25,782)	$ (44,731)	$ 88,305	$ (20,613)	$ (28,051)	$ (48,035)	$ (246,549)	$ (8,394)	$ 33,507
Basic and diluted weighted average common units outstanding (in units)									104,838,886	86,359,300	61,970,471
Subordinated Units
Earnings per unit
Net Loss (Income) Allocated to Limited Partners									$ 0	$ 3,915	$ (1,893)
Basic and diluted (loss) income per common unit (in dollars per share)								$ (0.68)			$ 0.32
Basic and diluted weighted average common units outstanding (in units)								5,919,346			5,919,346
Common Units
Earnings per unit
Less: Net income allocated to limited partners									$ (246,549)	$ (4,479)	$ 31,614
Basic and diluted (loss) income per common unit (in dollars per share)									$ (2.35)	$ (0.05)	$ 0.51