CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
CONSOLIDATED BALANCE SHEETS
Accounts receivable, allowance for doubtful accounts (in dollars)	$ 10,313	$ 10,022
Other intangible assets, accumulated amortization (in dollars)	$ 29,267	$ 27,375
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	60,000,000	60,000,000
Common stock, shares issued	36,346,814	36,113,202
Common stock, shares outstanding	36,346,814	36,113,202
Treasury stock, shares	141,154	141,154