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Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	2 Months Ended	3 Months Ended														8 Months Ended		12 Months Ended
	Dec. 31, 2014	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2012	Dec. 31, 2014	Apr. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Apr. 30, 2014	Apr. 30, 2013
Statement of Comprehensive Income [Abstract]
Net loss	$ (6,017)	$ (7,020)	$ 2,259	$ 943	$ (7,963)	$ 361	$ (154)	$ (15,633)	$ (11,033)	$ (575)	$ (163)	$ (13,518)	$ (11,474)	$ (21,092)	$ (8,379)	$ (5,810)		$ (11,781)		$ (27,404)	$ (54,463)
Other comprehensive (loss) income, net of taxes:
Unrealized loss resulting from changes in fair value of derivative instruments																				(36)	(2,910)
Realized loss on derivative instruments reclassified into earnings																				655	4,247
Unrealized (loss) gain resulting from changes in fair value of marketable securities																19		(51)		12	23
Other comprehensive (loss) income																19	$ 631	(51)	$ 19	631	1,360
Comprehensive loss																(5,791)		(11,832)		(26,773)	(53,103)
Less: Comprehensive income (loss) attributable to noncontrolling interests																208		1,188		(4,309)	(321)
Comprehensive loss attributable to common stockholders																$ (5,999)		$ (13,020)		$ (22,464)	$ (52,782)