Segment Reporting Segment Revenue and Profit or Loss Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items]
Revenue reconciliation	$ 169,441	$ 62,278	$ 464,915	$ 184,267
Profit or loss	(22,734)	(2,281)	(59,246)	(7,282)
Issuance of private perpetual preferred units	(241)		(241)
Net income attributable to non-controlling interests	(14,171)		(36,480)
Operating Segments [Member]
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items]
Revenue reconciliation	190,915	64,185	518,843	190,907
Profit or loss	(23,383)	(13,638)	(60,100)	(35,307)
Segment Reconciling Items [Member]
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items]
Revenue reconciliation	0	35	975	146
Profit or loss	0	(9,633)	975	(22,807)
Formation transaction expenses [Member]
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items]
Profit or loss	0	(1,507)	0	(4,507)
Private Perpetual Preferred Exchange Offering Costs [Member]
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items]
Profit or loss	(407)	0	(1,357)	0
Intersegment Eliminations [Member]
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items]
Revenue reconciliation	(21,474)	(1,942)	(54,903)	(6,786)
Profit or loss	(242)	(252)	(472)	(857)
Segment Reconciling Items, Unallocated [Member] | Investment Income [Member]
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items]
Profit or loss	$ 0	$ (35)	$ 0	$ (146)