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Income Taxes (Details Textual) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Provision for income taxes | $ 95 | $ 383 | $ (884) | $ 1,218 | $ 22,727 | $ 1,543 | $ 1,158 | $ 677 | $ 812 | $ 26,105 | $ 678
Effective Income Tax Rate, Continuing Operations |  |  |  |  |  |  |  |  | 17.80% | 36.40% | 5.60%
Undistributed Earnings Of Foreign Subsidiaries | 14,962 |  |  |  |  |  |  |  | 14,962 |  |
Operating Loss Carryforwards, Expiration Dates |  |  |  |  |  |  |  |  | Dec 31 2025 |  |
Tax Credit Carryforward, Expiration Date |  |  |  |  |  |  |  |  | Dec. 31, 2021 |  |
Liability for Uncertain Tax Positions, Current | 889 |  |  |  |  |  |  |  | 889 |  |
Liability for Uncertain Tax Positions, Noncurrent | 2,876 |  |  |  |  |  |  |  | 2,876 |  |
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate |  |  |  |  |  |  |  |  | 3,278 |  |
Income Tax Examination, Penalties and Interest Expense |  |  |  |  |  |  |  |  | 64 | 67 | 45
Income Tax Examination, Penalties and Interest Accrued | 706 |  |  |  | 740 |  |  |  | 706 | 740 |
Deferred Tax Liability Recognition Basis |  |  |  |  |  |  |  |  | The Company is required to provide a deferred tax liability corresponding to the difference between the financial reporting basis (which was remeasured to fair value upon the acquisition of an additional 24% of PST in 2011) and the tax basis in the previously held 50% ownership interest in PST (the “outside” basis difference). This outside basis difference will generally remain fixed until (1) dividends from the subsidiary exceed the parent’s share of earnings subsequent to the date it became a subsidiary or (2) there is a transaction that affects the Company’s ownership of PST. |  |
U S Federal [Member] |  |  |  |  |  |  |  |  |  |  |
Tax Credit Carryforward, Amount | 10,868 |  |  |  |  |  |  |  | 10,868 |  |
Operating Loss Carryforwards | 91,159 |  |  |  |  |  |  |  | 91,159 |  |
State and Local Jurisdiction [Member] |  |  |  |  |  |  |  |  |  |  |
Tax Credit Carryforward, Amount | 2,144 |  |  |  |  |  |  |  | 2,144 |  |
Operating Loss Carryforwards | 92,797 |  |  |  |  |  |  |  | 92,797 |  |
Foreign Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |
Tax Credit Carryforward, Amount | 1,810 |  |  |  |  |  |  |  | 1,810 |  |
Operating Loss Carryforwards | $ 15,517 |  |  |  |  |  |  |  | $ 15,517 |  |
General Business Tax Credit Carryforward [Member] |  |  |  |  |  |  |  |  |  |  |
Tax Credit Carryforward, Expiration Date |  |  |  |  |  |  |  |  | Dec. 31, 2021 |  |

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