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Other Comprehensive Income (Loss) Other Comprehensive Income Balance Components (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Statement of Comprehensive Income [Abstract]    
Unrealized gain on post-retirement benefit obligations $ 27,896 $ 27,691
Unrealized gain on marketable securities (69) 10
Unrealized gain (loss) on hedging activities, net of noncontrolling interest 42,184 (26,879)
Accumulated other comprehensive income $ 70,011 $ 822