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Consolidated Statements of Comprehensive Income (Parentheticals) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Statement of Income and Comprehensive Income [Abstract]      
Taxes due to change in non-controlling interest's protion of accumulated other comprehensive income due to issuance of Partnership unit $ 0 $ 0 $ 68
Taxes on hedging losses reclassified to earnings (48) 195 208
Taxes on adjustment in fair value of derivatives $ 181 $ (159) $ (26)