CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN EQUITY - 6 months ended Jun. 30, 2018 - USD ($) shares in Thousands, $ in Thousands	Total	Total Stockholders' Equity	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Treasury Stock	Accumulated Other Comprehensive Loss	Additional Paid-in Capital	Retained Earnings (Deficit)	Non-controlling Interest
Balance at beginning of period (in shares) at Dec. 31, 2017			13,235	21,485	(99)
Balance at beginning of period at Dec. 31, 2017	$ 161,303	$ 36,248	$ 132	$ 216	$ (2,011)	$ (11)	$ 26,914	$ 11,008	$ 125,055
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock based compensation	2,647	2,647					2,647
Restricted stock unit vesting (in shares)			258
Restricted stock unit vesting	(712)	(712)	$ 3				(715)
Consolidated net loss	(17,904)	(4,826)						(4,826)	(13,078)
Foreign currency translation adjustment for equity method investee	(58)	(22)				(22)			(36)
Distributions paid to non-controlling unit holders	(19,501)								(19,501)
Dividends paid to Class A common stockholders	(4,805)	(4,805)						(4,805)
Dividends to Preferred Stock	(4,055)	(4,055)						(4,055)
Acquisition of NG&E Customers	(6,138)								(6,138)
Balance at end of period (in shares) at Jun. 30, 2018			13,493	21,485	(99)
Balance at end of period at Jun. 30, 2018	$ 110,777	$ 24,475	$ 135	$ 216	$ (2,011)	$ (33)	$ 28,846	$ (2,678)	$ 86,302