Condensed Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Allowances for Accounts Receivable (in dollars)	$ 12,570	$ 10,849	$ 1,292
Preferred stock-issued	0	0	0
Common Stock, Par or Stated Value Per Share	$ 0.0001	$ 0.0001	$ 0.0001
Common stock, shares authorized	245,000,000	135,000,000	135,000,000
Common stock, shares issued	132,681,000	131,991,000	131,778,000
Common stock, shares outstanding	84,821,000	85,715,000	87,726,000
Treasury stock-shares at cost	47,860,000	46,276,000	44,052,000
Preferred Class A [Member]
Preferred stock-par value	$ 0.0001	$ 0.0001	$ 0.0001
Preferred stock- shares authorized	5,000,000	5,000,000	5,000,000
Preferred Class B [Member]
Preferred stock-par value	$ 0.0001	$ 0.0001	$ 0.0001
Preferred stock- shares authorized	60,000	60,000	60,000