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Derivative Financial Instruments (Details Textual)
3 Months Ended 3 Months Ended
Mar. 31, 2013
USD ($)
agreement
Apr. 01, 2012
USD ($)
Mar. 31, 2013
AUD
Dec. 31, 2012
USD ($)
Mar. 31, 2013
Fair Value Hedging
Interest Rate Swap
USD ($)
Apr. 01, 2012
Fair Value Hedging
Interest Rate Swap
USD ($)
Mar. 31, 2013
Minimum
Mar. 31, 2013
Maximum
Derivative Instruments, Gain (Loss) [Line Items]                
Gains (loss) recongized and recorded in earnings related to fair value hedge         $ 800,000 $ 200,000    
Interest Rate Swaps [Abstract]                
Number of Interest Rate Swap Agreements 4              
Notes bear interest at a rate 7.75%              
Notional amount coincide with the terms of the non-recourse debt 100,000,000              
Variable interest rate payment to the same counterparties             4.16% 4.29%
Fair value of the swap assets included as Other Non-Current Assests 5,500,000     6,200,000        
Ineffective portion of Fair value interest rate swap 0              
Fixed interest rate on cash flow interest rate derivative 9.70%              
Interest Rate Swap Agreements     50,900,000          
Net unrealized loss recognized in the periods and recorded in accumulated other comprehensive income, net of tax 100,000 0            
Interest Rate Cash Flow Hedge Liability at Fair Value (500,000)     (700,000)        
Ineffective portion of Cash Flow Hedge interest rate swap $ 0