Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Allowance for doubtful accounts	$ 7,698	$ 6,911
Accumulated amortization of other intangible assets	$ 15,279	$ 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)	74,423,000	74,204,000
Common stock outstanding (in shares)	72,882,000	72,601,000
Common stock in treasury (in shares)	1,541,000	1,603,000