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Selected Quarterly Financial Data (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Selected Quarterly Financial Data [Abstract]                      
Revenues $ 37,730,000 $ 36,100,000 $ 36,742,000 $ 38,635,000 $ 36,665,000 $ 36,499,000 $ 37,308,000 $ 37,712,000 $ 149,207,000 $ 148,184,000 $ 139,598,000
Net income 6,840,000 6,126,000 5,416,000 3,399,000 4,280,000 5,709,000 16,992,000 1,710,000 21,781,000 28,691,000 14,202,000
Net (loss) income attributable to common shareholders $ 3,356,000 $ 2,590,000 $ 1,915,000 $ (123,000) $ 747,000 $ 2,183,000 $ 13,458,000 $ (1,815,000) $ 7,738,000 $ 14,573,000 $ (1,131,000)
Per common share (basic and diluted) $ 0.04 [1] $ 0.03 [1] $ 0.02 [1] $ 0.00 [1] $ 0.01 [1] $ 0.03 [1] $ 0.17 [1] $ (0.03) [1] $ 0.09 $ 0.18 $ (0.03)
[1] Differences between the sum of the four quarterly per share amounts and the annual per share amounts are attributable to the effect of the weighted average outstanding share calculations for the respective periods.