Statement of Changes in Stockholders' Equity - 3 months ended Mar. 31, 2018 - USD ($) shares in Thousands, $ in Thousands	Common Stock Class A common stock	Common Stock Class B common stock	Treasury Stock Class A common stock	Additional Paid-in-Capital	Retained (Deficit)/ Earnings	Non-controlling Interest	Total
Balance at Dec. 31, 2017	$ 90	$ 10	$ (358)	$ 606,319	$ (136,274)	$ 116,349	$ 586,136
Balance (in shares) at Dec. 31, 2017	90,117	9,628	23
Increase (Decrease) Stockholders' Equity
Stock-compensation expense				1,264			1,264
Stock-compensation expense (in shares)	124
Dividends and accretion on preferred stock	$ 2			1,838	(1,968)		(128)
Dividends and accretion on preferred stock (in shares)	1,789
Net income (loss)					(25,361)	(3,559)	(28,920)
Balance at Mar. 31, 2018	$ 92	$ 10	$ (358)	$ 609,421	$ (163,603)	$ 112,790	$ 558,352
Balance (in shares) at Mar. 31, 2018	92,030	9,628	23