Annual report pursuant to Section 13 and 15(d)

Financial Instruments - Interest Rate Derivatives Market Adjustments (Details)

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Financial Instruments - Interest Rate Derivatives Market Adjustments (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Interest Rate Contract [Member]
     
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative gain (loss) in Other Comprehensive Income   $ (136)  
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) 166 0  
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]
     
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative gain (loss) in Other Comprehensive Income   (21,290)  
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 0 (5,814)  
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) 5,807 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 $ 88,596 $ 679 $ 0