Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Allowance for doubtful accounts	$ 45,726	$ 47,209
Accumulated amortization of other intangible assets	19,300	17,216
Allowance for doubtful accounts, noncurrent	$ 6,667	$ 10,000
STOCKHOLDERS’ EQUITY:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock authorized (in shares)	100,000,000	100,000,000
Common stock issued (in shares)	75,557,000	75,344,000
Common stock outstanding (in shares)	74,149,000	73,877,000
Common stock in treasury (in shares)	1,408,000	1,467,000