Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Intangible Assets (Schedule Of Changes To Amortizable Intangible Assets) (Details)

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Intangible Assets (Schedule Of Changes To Amortizable Intangible Assets) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Intangible Assets [Abstract]      
Net carrying value at beginning of period $ 58,637 $ 31,399  
Fair value of intangibles acquired in acquisitions   42,975  
Purchases of intangible lease premiums   9,006  
Discontinued operations (12,412)    
Amortization (15,375) (22,070)  
Impairment (Note 22) (1,173) (2,673) (196)
Net carrying value at end of period $ 29,677 $ 58,637 $ 31,399