Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets:
Allowance for doubtful accounts	$ 6,815	$ 3,919
Accumulated amortization of other intangible assets	$ 15,421	$ 12,909
STOCKHOLDERS’ EQUITY:
Common stock, par value (dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	72,484,000	71,868,000
Common stock, shares outstanding	72,484,000	71,868,000
Common stock in treasury, shares	1,828,000	1,892,000