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 of	$ 2,143	$ 2,398
Equity:
Preferred stock, authorized (in shares)	4,000	4,000
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Common stock, authorized (in shares)	40,000	40,000
Common stock, par value (in dollars per share)	$ 0.2	$ 0.2
Common stock, issued (in shares)	22,799	22,711
Common stock, outstanding (in shares)	22,799	22,711