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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