Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Allowance for doubtful accounts	$ 3,970	$ 4,506
Accumulated amortization of other intangible assets	$ 10,078	$ 7,909
STOCKHOLDERS’ EQUITY:
Common stock, par value (dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	100,000	100,000
Common stock, shares issued	70,036	69,473
Common stock in treasury, shares	1,983	2,684