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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
 [1]
Accounts receivable, allowance for uncollectible accounts $ 2,689 $ 3,264
Preferred shares, par value $ 0.001 $ 0.001
Preferred shares, shares authorized 5,000,000 5,000,000
Preferred shares, outstanding 0 0
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 22,599,061 22,682,295
Common stock, shares outstanding 22,599,061 22,682,295
Treasury stock, shares 3,886,873 3,112,840
[1] Derived from audited financial statements