Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Accounts Receivable, Allowance for Credit Losses	$ 9,070	$ 7,500
Common Stock, par value (in dollars per share)	$ 0.25	$ 0.25
Common Stock, shares authorized (in shares)	360,000,000	360,000,000
Common Stock, shares issued (in shares)	110,834,088	110,834,088
Treasury stock, shares (in shares)	11,567,025	11,903,252