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Properties, net (Details 4) ft² in Thousands, $ in Thousands |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Apr. 15, 2015 USD ($) ft² | Mar. 19, 2015 USD ($) ft² | Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Weighted average useful life |  |  |  |  | 9 years |
Revenues |  |  | $ 170,363 | $ 139,820 | $ 331,397 | $ 286,487
Income from continuing operations |  |  | 15,402 | $ 8,077 | $ 28,983 | $ 12,805
Tenant relationship value |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Weighted average useful life |  |  |  |  | 9 years |
2015 Acquisitions |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Land |  |  | 28,361 |  | $ 28,361 |
Building and improvements |  |  | 69,182 |  | 69,182 |
Intangible assets on real estate acquisitions |  |  | 45,940 |  | 45,940 |
Total assets |  |  | 143,483 |  | 143,483 |
Below-market leases |  |  | (1,093) |  | (1,093) |
Total acquisition cost |  |  | 142,390 |  | 142,390 |
Finite-lived intangible assets acquired |  |  |  |  | $ 45,940 |
Weighted average useful life |  |  |  |  | 7 years |
Revenues |  |  | 4,000 |  | $ 4,300 |
Income from continuing operations |  |  | $ 40 |  | 210 |
Operating property acquisition costs |  |  |  |  | 1,400 |
2015 Acquisitions | Tenant relationship value |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangible assets acquired |  |  |  |  | $ 20,024 |
Weighted average useful life |  |  |  |  | 10 years |
2015 Acquisitions | In-place lease value |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangible assets acquired |  |  |  |  | $ 20,041 |
Weighted average useful life |  |  |  |  | 5 years |
2015 Acquisitions | Above market leases |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangible assets acquired |  |  |  |  | $ 5,875 |
Weighted average useful life |  |  |  |  | 4 years |
250 W Pratt St | Baltimore, Maryland |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Square footage of real estate properties (in square feet) | ft² |  | 367 |  |  |  |
Acquired property percentage leased |  | 96.20% |  |  |  |
Total acquisition cost |  | $ 61,900 |  |  |  |
2600 Park Tower Drive | Vienna, Virginia |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Square footage of real estate properties (in square feet) | ft² | 237 |  |  |  |  |
Acquired property percentage leased | 100.00% |  |  |  |  |
Total acquisition cost | $ 80,500 |  |  |  |  |

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