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Accumulated Other Comprehensive Loss (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accumulated Other Comprehensive Loss [Abstract]      
Fair value adjustment of derivative instruments $ 0 $ 11,824 $ 16,356
Fair value adjustment of investment available for sale (962) 0 0
Tax effect 0 (4,230) (5,824)
Fair value adjustments, net of tax $ (962) $ 7,594 $ 10,532