Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Allowance for doubtful accounts	$ 5,316	$ 6,136
Accumulated amortization of other intangible assets	$ 18,663	$ 16,232
STOCKHOLDERS’ EQUITY:
Common stock, par value (dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (shares)	100,000,000	100,000,000
Common stock, shares issued (shares)	73,692,000	72,878,000
Common stock, shares outstanding (shares)	73,692,000	72,878,000
Common stock in treasury (shares)	1,758,000	1,821,000