Investment in Sunrise Energy (Condensed Statement of Operations - Sunrise) (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
Revenue	$ 66,322		$ 37,660		$ 140,549		$ 116,058
Expenses	(73,531)		(31,162)		(139,546)		(91,383)
Net income (loss)	(5,768)	[1]	4,830	[1]	826	[1]	18,463	[1]
Sunrise Energy [Member]
Revenue					2,328		2,551
Expenses					(1,945)		(1,513)
Net income (loss)					$ 383		$ 1,038

[1] There is no material difference between net income (loss) and comprehensive income (loss).