Net Income (Loss) Per Common Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]
Net income from continuing operations	$ 9,154	$ 17,573	$ 27,961	$ 3,216
Net loss (income) from continuing operations attributable to noncontrolling interests in consolidated entities	1,520	(9,825)	5,104	(9,755)
Net income (loss) from continuing operations attributable to common unit holders	10,674	7,748	33,065	(6,539)
(Loss) Income from discontinued operations	(148)	3,624	86,823	6,435
Net loss (income) from discontinued operations attributable to noncontrolling interests in consolidated entities	53	(1,577)	(30,878)	(2,807)
Net (loss) income from discontinued operations attributable to common unit holders	(95)	2,047	55,945	3,628
Net income (loss) attributable to common unitholders	$ 10,579	$ 9,795	$ 89,010	$ (2,911)
Net (loss) income per common unit - basic: (in dollars per unit)
Net income (loss) from continuing operations	$ 0.39	$ 0.27	$ 1.20	$ (0.22)
Net income from discontinued operations	0.00	0.07	2.02	0.12
Net income (loss) attributable to common unitholders	0.39	0.34	3.22	(0.10)
Earnings Per Share, Diluted, Two Class Method [Abstract]
Net income (loss) from continuing operations	0.38	0.27	1.19	(0.22)
Net income from discontinued operations	0.00	0.07	2.01	0.12
Net income (loss) attributable to common unitholders	$ 0.38	$ 0.34	$ 3.20	$ (0.10)
Weighted Average Number of Shares Outstanding, Basic [Abstract]
Weighted average common units outstanding - basic (in shares)	27,640,332	28,739,858	27,649,363	29,765,843
Incentive units	59,185	0	224,253	0
Unvested restricted units	26,705	35,582	26,083	0
Denominator for net income per common unit - diluted (in shares)	27,726,222	28,775,440	27,899,699	29,765,843
Incentive Units
Weighted Average Number of Shares Outstanding, Basic [Abstract]
Antidilutive securities excluded				16,032
Unvested Restricted Stock Units
Weighted Average Number of Shares Outstanding, Basic [Abstract]
Antidilutive securities excluded				35,134