Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments - Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) (Details)

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Financial Instruments - Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Interest Rate Contract [Member]
Dec. 31, 2013
Interest Rate Contract [Member]
Mar. 31, 2014
Designated as Hedging Instrument [Member]
Interest Rate Contract [Member]
Dec. 31, 2013
Designated as Hedging Instrument [Member]
Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]            
Change in fair value of interest rate cash flow hedges $ 0 $ 21,297 [1]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net     0 0 0 0
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net     0 0 0 0
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax $ 0 $ (30) [1]        
[1] Retrospectively adjusted as discussed in Note 1.