Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accounts receivable, allowance for uncollectible accounts	$ 2,928	$ 2,536
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	22,668,680	21,969,355
Common stock, shares outstanding	22,668,680	21,969,355