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Summary of Quarterly Results (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Summary of Quarterly Results [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 51,286 us-gaap_RealEstateRevenueNet | $ 50,077 us-gaap_RealEstateRevenueNet | $ 49,983 us-gaap_RealEstateRevenueNet | $ 49,468 us-gaap_RealEstateRevenueNet | $ 50,496 us-gaap_RealEstateRevenueNet | $ 49,886 us-gaap_RealEstateRevenueNet | $ 47,302 us-gaap_RealEstateRevenueNet | $ 48,775 us-gaap_RealEstateRevenueNet | $ 200,814 us-gaap_RealEstateRevenueNet | $ 196,459 us-gaap_RealEstateRevenueNet | $ 191,312 us-gaap_RealEstateRevenueNet
Net Income Attributable to Common Stockholders | $ 18,161 us-gaap_NetIncomeLoss | $ 17,692 us-gaap_NetIncomeLoss | $ 16,828 us-gaap_NetIncomeLoss | $ 15,244 us-gaap_NetIncomeLoss | $ 15,790 us-gaap_NetIncomeLoss | $ 13,824 us-gaap_NetIncomeLoss | $ 13,139 us-gaap_NetIncomeLoss | $ 14,162 us-gaap_NetIncomeLoss | $ 67,925 us-gaap_NetIncomeLoss | $ 56,915 us-gaap_NetIncomeLoss | $ 674,387 us-gaap_NetIncomeLoss
Net Income Per Common Share - Basic (in dollars per share) | $ 3.55 us-gaap_EarningsPerShareBasic | $ 3.46 us-gaap_EarningsPerShareBasic | $ 3.29 us-gaap_EarningsPerShareBasic | $ 2.98 us-gaap_EarningsPerShareBasic | $ 3.09 us-gaap_EarningsPerShareBasic | $ 2.71 us-gaap_EarningsPerShareBasic | $ 2.57 us-gaap_EarningsPerShareBasic | $ 2.77 us-gaap_EarningsPerShareBasic |  |  |
Net Income Per Common Share - Diluted (in dollars per share) | $ 3.55 us-gaap_EarningsPerShareDiluted | $ 3.46 us-gaap_EarningsPerShareDiluted | $ 3.29 us-gaap_EarningsPerShareDiluted | $ 2.98 us-gaap_EarningsPerShareDiluted | $ 3.09 us-gaap_EarningsPerShareDiluted | $ 2.71 us-gaap_EarningsPerShareDiluted | $ 2.57 us-gaap_EarningsPerShareDiluted | $ 2.77 us-gaap_EarningsPerShareDiluted |  |  |

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