Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current Assets:
Allowance for doubtful accounts	$ 22,691	$ 21,696
Deferred financing costs, current	920	575
Deferred financing costs, noncurrent	$ 1,062	$ 1,534
Stockholders' Equity:
Preferred stock, par value (in dollars per share)	$ 0.10	$ 0.10
Preferred stock, shares authorized	500,000	500,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Series Y preferred stock, shares issued		0
Series Y preferred stock, shares outstanding		0
Series Y preferred stock, par value (in dollars per share)	$ 0.10	$ 0.10
Series Y preferred stock, shares authorized	350,000	0
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized	220,000,000	220,000,000
Common stock, shares issued	30,515,334	30,492,044
Common stock, shares outstanding	30,515,334	30,492,044