CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests	Class A Common Stock	Class A Common Stock Common Stock	Class B Common Stock	Class B Common Stock Common Stock
Beginning balance at Dec. 31, 2016	$ (24,550)	$ 348,434	$ (373,308)	$ (68)	$ (24)		$ 406		$ 10
Beginning balance (in shares) at Dec. 31, 2016							40,572,000		988,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of Class A common stock	1,779	1,772					$ 7
Issuances of Class A common stock (in shares)							726,000
Stock-based compensation	6,432	6,432
Other	24				24
Net income (loss)	(21,799)		(21,799)
Hedging activity	252			252	0
Ending balance at Dec. 31, 2017	(37,862)	356,638	(395,107)	184	0		$ 413		$ 10
Ending balance (in shares) at Dec. 31, 2017						41,298,000	41,298,000	988,000	988,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of Class A common stock	1,017	1,012					$ 5
Issuances of Class A common stock (in shares)							496,000
Issuance of Class A common stock - acquisition	7,622	7,621					$ 1
Issuance of Class A common stock - acquisition (in shares)							150,000
Stock-based compensation	8,445	8,445
Net income (loss)	6,420		6,420
Hedging activity	(1,474)			(1,474)
Ending balance at Dec. 31, 2018	(15,832)	373,716	(388,669)	(1,308)	0		$ 419		$ 10
Ending balance (in shares) at Dec. 31, 2018						41,944,000	41,944,000	988,000	988,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A common stock - equity offering	100,446	100,410					$ 36
Issuance of Class A common stock - equity offering (in shares)							3,565,000
Issuances of Class A common stock	3,996	3,984					$ 12
Issuances of Class A common stock (in shares)							1,227,000
Issuance of Class A common stock - acquisition	0	(1)					$ 1
Issuance of Class A common stock - acquisition (in shares)							67,000
Stock-based compensation	7,223	7,223
Net income (loss)	31,653		31,653
Hedging activity	(4,733)			(4,733)
Ending balance at Dec. 31, 2019	$ 122,753	$ 485,332	$ (357,016)	$ (6,041)	$ 0		$ 468		$ 10
Ending balance (in shares) at Dec. 31, 2019						46,803,000	46,803,000	988,000	988,000