Annual report pursuant to Section 13 and 15(d)

Supplementary Quarterly Financial Data (Summary Of Quarterly Results Of Operations) (Details)

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Supplementary Quarterly Financial Data (Summary Of Quarterly Results Of Operations) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Supplementary Quarterly Financial Data [Abstract]                      
Operating revenue $ 56,658 $ 54,254 $ 50,709 $ 49,535 $ 48,856 $ 48,623 $ 47,309 $ 47,284 $ 211,156 $ 192,072 $ 191,040
Income from continuing operations 10,383 2,366 10,080 8,700 8,975 [1] 9,374 [1] 8,618 [1] 8,012 [1] 31,529 34,979 20,581
Income (loss) from discontinued operations             7,686 [1] (124) [1]    7,562 1,073
Net Income 10,383 2,366 10,080 8,700 8,975 9,374 16,304 7,888 31,529 42,541 21,654
Net income attributable to common shareholders $ 10,256 $ 2,339 $ 9,737 $ 8,260 $ 8,531 $ 8,923 $ 15,761 $ 7,427 $ 30,592 $ 40,642 $ 19,916
Basic $ 0.37 $ 0.08 $ 0.35 $ 0.30 $ 0.31 $ 0.32 $ 0.57 $ 0.27 $ 1.11 $ 1.48 $ 0.84
Diluted $ 0.37 $ 0.08 $ 0.35 $ 0.30 $ 0.31 $ 0.32 $ 0.57 $ 0.27 $ 1.10 $ 1.48 $ 0.84
[1] 2010 data as presented in this table differ from the amounts as presented in the Company's quarterly reports due to the impact of discontinued operations accounting with respect to the ten properties sold in 2010 as described in Note 5.