Annual report pursuant to Section 13 and 15(d)

Financial Instruments - Interest Rate Derivatives Market Adjustments (Details)

v2.4.0.6
Financial Instruments - Interest Rate Derivatives Market Adjustments (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Interest Rate Contract [Member]
     
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative gain (loss) in Other Comprehensive Income   $ 0  
Derivative gain (loss) reclassified from Accumulated OCI into Interest Expense (Effective Portion) 0 0  
Derivative gain (loss) recognized in income (ineffective portion and amount excluded from Effectiveness Testing) 0 0  
Interest Rate Contract [Member] | Gain (Loss) on Settlement of Derivative Instrument [Member]
     
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative gain (loss) in Other Comprehensive Income (136)    
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]
     
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative gain (loss) in Other Comprehensive Income (21,290) 0  
Derivative gain (loss) reclassified from Accumulated OCI into Interest Expense (Effective Portion) 0 0  
Derivative gain (loss) recognized in income (ineffective portion and amount excluded from Effectiveness Testing) 0 0  
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]
     
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative gain (loss) in Other Comprehensive Income (5,814) 0  
Derivative gain (loss) reclassified from Accumulated OCI into Interest Expense (Effective Portion) 0 0  
Derivative gain (loss) recognized in income (ineffective portion and amount excluded from Effectiveness Testing) 0 0  
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member]
     
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 679 $ 0 $ 0