CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss	$ 23,909	$ 25,443
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	$ 87,142	$ 8,876
Preferred stock, par value	$ 0.01
Preferred stock, shares authorized	20,000,000
Preferred stock, shares issued	21,612	0
Treasury stock, shares outstanding	21,870,961	21,850,356
Senior Notes [Member]
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	$ 1,039
Common Stock
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	210,000,000	210,000,000
Common stock, shares issued	67,596,515	59,308,018
Common stock, shares outstanding	50,064,985	41,797,093
Common Class B
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	4,339,431	4,339,431
Common stock, shares outstanding	0	0
Preferred Stock
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, shares outstanding	0	0
Series A Preferred Stock
Preferred stock, par value	$ 0.01
Preferred stock, shares authorized	25,000
Preferred stock, shares issued	21,612