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Schedule of Interest Rate Swap Agreements on Accumulated Other Comprehensive Income (Details) (Interest Rate Swap, USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Interest Rate Swap
   
Derivative Instruments And Hedging Activities Disclosures [Line Items]    
Beginning balance $ (111,174) $ (243,051)
Unrealized gain on interest rate swaps 0 15,030
Reclassification of net losses included in income statement 24,684 116,847
Ending balance $ (86,490) $ (111,174)