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Quarterly Financial Information (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Quarterly Financial Information                      
Revenues $ 24,512 $ 23,789 $ 23,091 $ 22,641 $ 22,299 $ 21,431 $ 21,181 $ 20,254 $ 94,033 $ 85,165 $ 74,302
Net (loss) income from discontinued operations       16 (24) (25) (25) (25) 16 (99) 458
Net income available to common stockholders $ 11,854 $ 11,583 $ 12,194 $ 12,009 $ 11,656 $ 11,472 $ 11,311 $ 5,393 $ 47,640 $ 39,832 $ 29,587
Net income per common share from continuing operations available to common stockholders:                      
Basic (in dollars per share) $ 0.39 $ 0.38 $ 0.40 $ 0.40 $ 0.39 $ 0.38 $ 0.38 $ 0.21 $ 1.58 [1] $ 1.37 [1] $ 1.19 [1]
Diluted (in dollars per share) $ 0.39 $ 0.38 $ 0.40 $ 0.40 $ 0.39 $ 0.38 $ 0.38 $ 0.21 $ 1.57 [1] $ 1.37 [1] $ 1.19 [1]
Net loss per common share from disconinued operations                      
Basic (in dollars per share) $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 [1] $ 0.00 [1] $ 0.02 [1]
Diluted (in dollars per share) $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 [1] $ (0.01) [1] $ 0.02 [1]
Net income per common share available to common stockholders:                      
Basic (in dollars per share) $ 0.39 $ 0.38 $ 0.40 $ 0.40 $ 0.39 $ 0.38 $ 0.38 $ 0.20 $ 1.58 [1] $ 1.36 [1] $ 1.21 [1]
Diluted (in dollars per share) $ 0.39 $ 0.38 $ 0.40 $ 0.40 $ 0.39 $ 0.38 $ 0.37 $ 0.20 $ 1.57 [1] $ 1.36 [1] $ 1.21 [1]
Dividends per share declared (in dollars per share) $ 0.465 $ 0.455 $ 0.435 $ 0.435 $ 0.42 $ 0.42 $ 0.42 $ 0.42      
Dividend per share paid (in dollars per share) $ 0.465 $ 0.455 $ 0.435 $ 0.435 $ 0.42 $ 0.42 $ 0.42 $ 0.42 $ 1.79 $ 1.68 $ 1.58
[1] NOTE: Computations of per share amounts from continuing operations, discontinued operations and net income are made independently. Therefore, the sum of per share amounts from continuing operations and discontinued operations may not agree with the per share amounts from net income available to common stockholders.