Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Net Income (Loss) Attributable to Parent	$ 13,907	$ 69,459	$ 73,942	$ 232,221
Revenues	53,638	124,618	177,809	412,390
Income generating assets [Member]
Segment Reporting Information [Line Items]
Net Income (Loss) Attributable to Parent	14,049	69,459	74,084	232,221
Revenues	39,510	124,618	163,681	412,390
Product sales [Member]
Segment Reporting Information [Line Items]
Net Income (Loss) Attributable to Parent	(142)	0	(142)	0
Revenues	$ 14,128	$ 0	$ 14,128	$ 0