Goodwill Narrative (Details) - USD ($) $ in Thousands		3 Months Ended						6 Months Ended		9 Months Ended		12 Months Ended
	Aug. 26, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2015	Jun. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired				$ 0			$ 0	$ 0	$ 0	$ 5,754	$ 0	$ 5,754	$ 0	$ 860
Cash Acquired from Acquisition	$ 1,395											$ 1,395
Business acquisition, percentage acquired	100.00%											100.00%
Goodwill impairment		$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	(174,226)
Estimated working capital adjustment												905
Business Combination, Consideration Transferred, Liabilities Incurred												$ 3,122
Business Combination, Consideration Transferred	$ 9,781
Electricity Operating Segment [Member]
Goodwill [Line Items]
Goodwill impairment														$ (174,200)