Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Allowance for doubtful accounts	$ 10,293	$ 11,195
Current deferred financing costs	528	585
Noncurrent deferred financing costs	$ 34,943	$ 36,274
Shares held in treasury (in shares)	783,108	688,017
Series AA PREF Stock
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, cumulative dividends (in dollars per share)	$ 63.80	$ 63.80
Preferred stock, shares authorized (in shares)	5,720	5,720
Preferred stock, shares outstanding (in shares)	5,720	5,720
Preferred stock, shares issued (in shares)	5,720	5,720
Class A CMN Stock
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	362,500,000	362,500,000
Common stock, shares issued (in shares)	87,845,125	87,540,838
Common stock, shares outstanding (in shares)	87,062,017	86,852,821
Class B CMN Stock
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	37,500,000	37,500,000
Common stock, shares issued (in shares)	14,420,085	14,420,085
Common stock, shares outstanding (in shares)	14,420,085	14,420,085