CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accounts receivable, allowance for uncollectible accounts	$ 2,536	$ 3,069
Preferred shares, par value	$ 0.001	$ 0.001
Preferred shares, shares authorized	5,000,000	5,000,000
Preferred shares, outstanding
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	21,969,355	25,943,214
Common stock, shares outstanding	21,969,355	25,943,214