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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

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