Annual report pursuant to Section 13 and 15(d)

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

v2.4.0.6
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
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]
     
Derivative [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 679 $ 0 $ 0