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Acquisition (Details) (USD $) In Thousands, unless otherwise specified | Jan. 05, 2012 | Dec. 31, 2011
--- | --- | ---
Cash | $ 19,779 |
Common Shares (1,940,413 shares) | 10,197 |
Pst Eletronica Ltda [Member] |  |
Fair value of consideration transferred | 29,976 |
Fair value of the Company's previously held equity interest |  | 104,118
Pst Eletronica Ltda [Member] | Noncontrolling Interest [Member] |  |
Cash |  | 29,669
Common Shares (1,940,413 shares) |  | 15,310
Fair value of consideration transferred |  | 44,979
Fair value of the Company's previously held equity interest |  | 104,118
Fair value of noncontrolling interest |  | 48,727
Total fair value of PST |  | $ 197,824

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