Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Allowance for doubtful accounts	$ 9,795	$ 6,911
Accumulated amortization of other intangible assets	$ 11,659	$ 14,672
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)	74,791,000	74,204,000
Common stock outstanding (in shares)	73,266,000	72,601,000
Common stock in treasury (in shares)	1,525,000	1,603,000