Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Allowance for doubtful accounts receivable	$ 3,852	$ 2,811
Property and equipment, net (variable interest entity restricted)	7,144	7,298
Current portion of long-term debt and capitalized lease obligations (variable interest entity nonrecourse)	206	173
Long-term debt and capitalized lease obligations, less current portion (variable interest entity non recourse)	$ 5,472	$ 5,067
Redeemable preferred stock, par value (dollars per share)	$ 0.10	$ 0.10
Redeemable preferred stock, shares authorized (shares)	5,000	5,000
Redeemable preferred stock, shares issued (shares)	5,000	5,000
Redeemable preferred stock, shares outstanding (shares)	5,000	5,000
Preferred stock, par value (dollars per share)	$ 0.10	$ 0.10
Preferred stock, shares authorized (shares)	200,000	200,000
Preferred stock, shares issued (shares)		0
Preferred stock, shares outstanding (shares)		0
Common stock, par value (dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (shares)	20,000,000	20,000,000
Common stock, shares issued (shares)	6,161,000	6,061,000
Common stock, shares outstanding (shares)	5,929,000	5,829,000
Treasury stock, shares (shares)	232,000	232,000