Condensed Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 21,908	$ 21,696
Unamortized Deferred financing costs, current	920	575
Unamortized Deferred financing costs, noncurrent	$ 1,293	$ 1,534
Preferred stock, par value (in dollars per share)	$ 0.10	$ 0.10
Preferred stock, shares authorized (in shares)	500,000	500,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Series Y preferred stock, par value (in dollars per share)	$ 0.10	$ 0.10
Series Y preferred stock, shares authorized (in shares)	350,000	0
Series Y preferred stock, shares issued (in shares)	0	0
Series Y preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	220,000,000	220,000,000
Common stock, shares issued (in shares)	30,526,793	30,492,044
Common stock, shares outstanding (in shares)	30,526,793	30,492,044