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Consolidated Statements of Shareholders Equity (Parenthetical) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Statement of Stockholders' Equity [Abstract]    
Tax on marketable equity securities $ 1,168 $ 3,516
Cumulative effect of change in accounting principle, net of deferred tax    543
Issuance costs on public offering    838
Cash issued to noncontrolling shareholder for future earn-in $ 300 $ 200