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Summary of Quarterly Results (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
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 147,810 us-gaap_RealEstateRevenueNet | $ 146,558 us-gaap_RealEstateRevenueNet | $ 150,500 us-gaap_RealEstateRevenueNet | $ 152,114 us-gaap_RealEstateRevenueNet | $ 138,658 us-gaap_RealEstateRevenueNet | $ 143,354 us-gaap_RealEstateRevenueNet | $ 140,664 us-gaap_RealEstateRevenueNet | $ 139,554 us-gaap_RealEstateRevenueNet | $ 596,982 us-gaap_RealEstateRevenueNet | $ 562,210 us-gaap_RealEstateRevenueNet | $ 535,679 us-gaap_RealEstateRevenueNet
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | (1,869)us-gaap_ProfitLoss | 8,882 us-gaap_ProfitLoss | 2,174 us-gaap_ProfitLoss | (2,245)us-gaap_ProfitLoss | 21,002 us-gaap_ProfitLoss | 11,088 us-gaap_ProfitLoss | 7,180 us-gaap_ProfitLoss | 3,919 us-gaap_ProfitLoss | 6,942 us-gaap_ProfitLoss | 43,189 us-gaap_ProfitLoss | 6,529 us-gaap_ProfitLoss
Net Income (Loss) Attributable to Parent | $ (3,585)us-gaap_NetIncomeLoss | $ 6,967 us-gaap_NetIncomeLoss | $ 385 us-gaap_NetIncomeLoss | $ (4,041)us-gaap_NetIncomeLoss | $ 18,975 us-gaap_NetIncomeLoss | $ 9,173 us-gaap_NetIncomeLoss | $ 5,308 us-gaap_NetIncomeLoss | $ 2,058 us-gaap_NetIncomeLoss | $ 6,975 us-gaap_NetIncomeLoss | $ 42,777 us-gaap_NetIncomeLoss | $ 6,595 us-gaap_NetIncomeLoss
Earnings Per Share, Basic | $ (0.02)us-gaap_EarningsPerShareBasic | $ 0.04 us-gaap_EarningsPerShareBasic | $ 0.00 us-gaap_EarningsPerShareBasic | $ (0.03)us-gaap_EarningsPerShareBasic | $ 0.12 us-gaap_EarningsPerShareBasic | $ 0.06 us-gaap_EarningsPerShareBasic | $ 0.03 us-gaap_EarningsPerShareBasic | $ 0.01 us-gaap_EarningsPerShareBasic | $ 0.00 us-gaap_EarningsPerShareBasic | $ 0.23 us-gaap_EarningsPerShareBasic | $ (0.06)us-gaap_EarningsPerShareBasic
Earnings Per Share, Diluted | $ (0.02)us-gaap_EarningsPerShareDiluted | $ 0.04 us-gaap_EarningsPerShareDiluted | $ 0.00 us-gaap_EarningsPerShareDiluted | $ (0.03)us-gaap_EarningsPerShareDiluted | $ 0.12 us-gaap_EarningsPerShareDiluted | $ 0.06 us-gaap_EarningsPerShareDiluted | $ 0.03 us-gaap_EarningsPerShareDiluted | $ 0.01 us-gaap_EarningsPerShareDiluted | $ 0.00 us-gaap_EarningsPerShareDiluted | $ 0.23 us-gaap_EarningsPerShareDiluted | $ (0.06)us-gaap_EarningsPerShareDiluted

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