Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments - Changes in Fair Value of De-Designated Interest Rate Derivatives (Details)

v2.4.0.8
Financial Instruments - Changes in Fair Value of De-Designated Interest Rate Derivatives (Details) (Not Designated as Hedging Instrument [Member], Interest Rate Contract [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]
       
Derivative [Line Items]        
Increase (Decrease) in Fair Value of Derivative Instruments, Not Designated as Hedging Instruments $ 101,263 $ 0 $ 83,279 $ 0