Annual report pursuant to Section 13 and 15(d)

Financial Instruments - Fair Value of Interest Rate Derivatives by Balance Sheet Location (Details)

v2.4.0.8
Financial Instruments - Fair Value of Interest Rate Derivatives by Balance Sheet Location (Details) (Interest Rate Contract [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Designated as Hedging Instrument [Member] | Non-current Liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Interest Rate Derivative Liabilities, at Fair Value $ 0 $ 21,290
Not Designated as Hedging Instrument [Member] | Noncurrent Derivative Assets [Member]
   
Derivatives, Fair Value [Line Items]    
Interest Rate Derivative Assets, at Fair Value 98,123 0
Not Designated as Hedging Instrument [Member] | Non-current Liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Interest Rate Derivative Liabilities, at Fair Value 0 5,134
Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Interest Rate Derivative Liabilities, at Fair Value $ 13,484 $ 0