Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Accounts receivable, allowance for uncollectible accounts	$ 4,236	$ 2,536	[1]
Preferred shares, par value	$ 0.001	$ 0.001	[1]
Preferred shares, shares authorized	5,000,000	5,000,000	[1]
Preferred shares, outstanding			[1]
Common stock, par value	$ 0.001	$ 0.001	[1]
Common stock, shares authorized	100,000,000	100,000,000	[1]
Common stock, shares issued	22,303,706	21,969,355	[1]
Common stock, shares outstanding	22,303,706	21,969,355	[1]

[1] Derived from audited financial statements