Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Allowance for doubtful accounts	$ 47,209	$ 11,985
Accumulated amortization of other intangible assets	17,216	12,853
Allowance for doubtful accounts, noncurrent	$ 10,000	$ 0
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)	75,344,000	74,960,000
Common stock outstanding (in shares)	73,877,000	73,436,000
Common stock in treasury (in shares)	1,467,000	1,524,000