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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Accounts receivable, allowance for uncollectible accounts $ 3,607 $ 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 22,304,756 21,969,355 [1]
Common stock, shares outstanding 22,304,756 21,969,355 [1]
[1] Derived from audited financial statements