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Real Estate Investments Proforma (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition, Pro Forma Information [Line Items] |  |
Document Fiscal Year Focus | 2016 |
Business Acquisition, Pro Forma Revenue | $ 622,124 | $ 589,506
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax | 121,921 | 119,339
Business Acquisition, Pro Forma Net Income (Loss) | $ 146,111 | $ 131,396
Business Acquisition, Pro Forma Earnings Per Share, Basic | $ 0.0142 | $ 0.0137
Business Acquisition, Pro Forma Earnings Per Share, Diluted | $ 0.0142 | $ 0.0136
Parent Company [Member] | Leases, Acquired-in-Place [Member] |  |
Business Acquisition, Pro Forma Information [Line Items] |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 7 years 4 months 24 days |
Market Common Clarendon [Member] |  |
Business Acquisition, Pro Forma Information [Line Items] |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual | $ 11,427 |
Business Combination, Pro Forma Information, Expenses of Acquiree since Acquisition Date, Actual | 798 |
Business Combination, Transaction Costs | $ 1,600 |
Acquired Lease Intangible Liabilities [Member] | Parent Company [Member] |  |
Business Acquisition, Pro Forma Information [Line Items] |  |
Weighted Average Accretion Period of Intangible Liabilities | 7 years 10 months 24 days |

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