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Statements Of Consolidated Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Net income $ 45,097 $ 21,929 $ 73,447 $ 148,112
Other comprehensive income (loss):        
Net unrealized gain (loss) on available-for-sale securities 1,849 (633) 35,078 (29,615)
Reclassification of unrealized (gain) loss on available-for-sale securities to net income (6,409) (6,962) (6,750) (19,211)
Net unrealized (loss) gain on interest rate agreements (3,258) 4,018 (17,454) 25,043
Reclassification of unrealized loss on interest rate agreements to net income 32 62 131 219
Total other comprehensive income (loss) (7,786) (3,515) 11,005 (23,564)
Total Comprehensive Income $ 37,311 $ 18,414 $ 84,452 $ 124,548