Members' Equity - AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive loss, beginning balance			$ (5,303)
Other Comprehensive Income (Loss), before Reclassifications, before Tax			(7,086)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax			1,601
Other Comprehensive Income (Loss), Net of Tax	$ (5,255)	$ 2,201	(5,485)	$ 1,500
Accumulated other comprehensive loss, ending balance	(10,788)		(10,788)
Unrealized Gain (Loss) on Derivaitve Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive loss, beginning balance			(5,279)
Other Comprehensive Income (Loss), before Reclassifications, before Tax			(7,127)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax			1,601
Other Comprehensive Income (Loss), Net of Tax			(5,526)
Accumulated other comprehensive loss, ending balance	(10,805)		(10,805)
Unrealized Gain (Loss) on Available-For-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive loss, beginning balance			(24)
Other Comprehensive Income (Loss), before Reclassifications, before Tax			41
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax			0
Other Comprehensive Income (Loss), Net of Tax			41
Accumulated other comprehensive loss, ending balance	$ 17		$ 17