Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Allowance for doubtful accounts	$ 6,376	$ 4,608
Accumulated amortization of other intangible assets	$ 14,065	$ 19,473
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)	74,187,000	73,793,000
Common stock outstanding (in shares)	72,510,000	72,034,000
Common stock in treasury (in shares)	1,677,000	1,759,000