Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Allowance for doubtful accounts	$ 4,608	$ 6,136
Accumulated amortization of other intangible assets	$ 19,473	$ 16,232
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)	73,793,000	72,878,000
Common stock outstanding (in shares)	73,793,000	72,878,000
Common stock in treasury (in shares)	1,759,000	1,821,000