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Financial Instruments (Details Textual)
 6 Months Ended
Jun. 30, 2012
USD ($)
Dec. 31, 2011
USD ($)
Jun. 30, 2012
Wells Fargo Bank, NA [Member]
USD ($)
Jun. 30, 2012
DnB Nor Bank ASA [Member]
USD ($)
Dec. 31, 2011
6.5% Senior Secured Notes [Member]
EUR (€)
Jun. 30, 2012
Minimum [Member]
Wells Fargo Bank, NA [Member]
Rate
Jun. 30, 2012
Minimum [Member]
DnB Nor Bank ASA [Member]
Rate
Jun. 30, 2012
Maximum [Member]
Wells Fargo Bank, NA [Member]
Rate
Jun. 30, 2012
Maximum [Member]
DnB Nor Bank ASA [Member]
Rate
Financial Instruments (Textual) [Abstract]                  
Percentage of Senior Secured Notes         6.50%        
Forward currency contracts aggregate exchange value     $ 24,000,000 $ 30,000,000          
Forward currency contracts, exchange rate           1.0 5.99 1.03 6.05
Foreign currency contracts maturing value     4,000,000 5,000,000          
Estimated fair value of currency forward contracts included in balance sheet (100,000) (800,000)              
Estimated fair value of currency forward contracts included accounts and other receivables 200,000                
Estimated fair value of currency forward contracts included accounts payable and accrued liabilities 300,000                
Currency transaction loss 100,000                
Debt instrument, estimated market price per euro 1,000 principal amount         1,004        
Debt instrument base principal amount         € 1,000