Equity	9 Months Ended
Sep. 30, 2017
Equity [Abstract]
Equity	Equity Stockholders’ Equity On May 4, 2016, the Company commenced an at-the-market continuous equity offering program (the “ATM Program”) through which the Company could, from time to time, issue and sell shares of its common stock having an aggregate offering price of up to $75.0 million. During the nine months ended September 30, 2017, the Company issued and sold an aggregate of 450,690 shares of common stock at a weighted average price of $14.08 per share under the ATM Program, receiving net proceeds, after offering costs and commissions, of $6.2 million. On May 12, 2017, the Company completed an underwritten public offering of 6.9 million shares of common stock at a public offering price of $13.00 per share, which resulted in net proceeds after offering costs and commissions of $85.3 million. As of September 30, 2017 and December 31, 2016, the Company’s authorized capital was 500 million shares of common stock and 100 million shares of preferred stock. The Company had 44,936,652 and 37,490,361 shares of common stock issued and outstanding as of September 30, 2017 and December 31, 2016, respectively. No shares of preferred stock were issued and outstanding as of September 30, 2017 or December 31, 2016. Redeemable Noncontrolling Interests The noncontrolling interest holder of Johns Hopkins Village has the option to redeem the 20% noncontrolling interest in that entity (the "Put Option"). Currently, the Put Option may be redeemed for $2.0 million in cash or the equivalent amount in Class A units of limited partnership interest in the Operating Partnership ("Class A Units"), which is in the holder's control. Beginning in August 2018, the Put Option may be settled for the fair value of the 20% noncontrolling interest in Johns Hopkins Village, as determined by appraised value. Because the method of the Put Option's redemption is outside of the Company's control, it has been included in temporary equity. If the Put Option is exercised for redemption in the form of Class A Units, the noncontrolling interest will be reclassified into permanent equity. Noncontrolling Interests As of September 30, 2017 and December 31, 2016, the Company held a 71.6% and 68.1% interest, respectively, in the Operating Partnership. The Company is the primary beneficiary of the Operating Partnership as it has the power to direct the activities of the Operating Partnership and the rights to absorb 71.6% of the net income of the Operating Partnership. As the primary beneficiary, the Company consolidates the financial position and results of operations of the Operating Partnership. Noncontrolling interests in the Company represent units of limited partnership interest in the Operating Partnership not held by the Company. The Company's financial position and results of operations are the same as those of the Operating Partnership. The noncontrolling interest for the consolidated entities under development or construction (see Note 1) was zero as of September 30, 2017 and December 31, 2016. As of September 30, 2017, there were 17,570,512 Class A Units not held by the Company. As partial consideration for the acquisition of Columbus Village, the Operating Partnership issued 1,000,000 Class B Units on July 10, 2015 and issued 275,000 Class C Units on January 10, 2017. The Class B Units were automatically converted to Class A Units on July 10, 2017. Subject to the occurrence of certain events, the Class C Units will not earn or accrue distributions until January 10, 2018, at which time they automatically will convert into Class A Units. On January 10, 2017, the Operating Partnership issued 68,691 Class A Units to acquire the remaining 20% interest in the Town Center Phase VI project. Common Stock Dividends and Class A Unit Distributions On January 5, 2017, the Company paid cash dividends of $6.7 million to common stockholders and the Operating Partnership paid cash distributions of $3.0 million to holders of Class A Units. On April 6, 2017, the Company paid cash dividends of $7.2 million to common stockholders and the Operating Partnership paid cash distributions of $3.2 million to holders of Class A Units. On July 6, 2017, the Company paid dividends of $8.6 million to common stockholders and the Operating Partnership paid cash distributions of $3.1 million to holders of Class A Units. On August 4, 2017, the Board of Directors declared a cash dividend and distribution of $0.19 per share and unit payable on October 5, 2017 to stockholders and unitholders of record on September 27, 2017. Subsequent to September 30, 2017 On October 2, 2017, due to the request of holders of Class A Units to tender an aggregate of 358,879 units for redemption by the Operating Partnership, the Company elected to satisfy the redemption requests with an aggregate cash payment of $4.9 million. On October 5, 2017, the Company paid dividends of $8.5 million to common stockholders and the Operating Partnership paid cash distributions of $3.3 million to holders of Class A Units.

Equity

Stockholders’ Equity

On May 4, 2016, the Company commenced an at-the-market continuous equity offering program (the “ATM Program”) through which the Company could, from time to time, issue and sell shares of its common stock having an aggregate offering price of up to $75.0 million. During the nine months ended September 30, 2017, the Company issued and sold an aggregate of 450,690 shares of common stock at a weighted average price of $14.08 per share under the ATM Program, receiving net proceeds, after offering costs and commissions, of $6.2 million.

On May 12, 2017, the Company completed an underwritten public offering of 6.9 million shares of common stock at a public offering price of $13.00 per share, which resulted in net proceeds after offering costs and commissions of $85.3 million.

As of September 30, 2017 and December 31, 2016, the Company’s authorized capital was 500 million shares of common stock and 100 million shares of preferred stock. The Company had 44,936,652 and 37,490,361 shares of common stock issued and outstanding as of September 30, 2017 and December 31, 2016, respectively. No shares of preferred stock were issued and outstanding as of September 30, 2017 or December 31, 2016.

Redeemable Noncontrolling Interests

The noncontrolling interest holder of Johns Hopkins Village has the option to redeem the 20% noncontrolling interest in that entity (the "Put Option"). Currently, the Put Option may be redeemed for $2.0 million in cash or the equivalent amount in Class A units of limited partnership interest in the Operating Partnership ("Class A Units"), which is in the holder's control. Beginning in August 2018, the Put Option may be settled for the fair value of the 20% noncontrolling interest in Johns Hopkins Village, as determined by appraised value. Because the method of the Put Option's redemption is outside of the Company's control, it has been included in temporary equity. If the Put Option is exercised for redemption in the form of Class A Units, the noncontrolling interest will be reclassified into permanent equity.

Noncontrolling Interests

As of September 30, 2017 and December 31, 2016, the Company held a 71.6% and 68.1% interest, respectively, in the Operating Partnership. The Company is the primary beneficiary of the Operating Partnership as it has the power to direct the activities of the Operating Partnership and the rights to absorb 71.6% of the net income of the Operating Partnership. As the primary beneficiary, the Company consolidates the financial position and results of operations of the Operating Partnership. Noncontrolling interests in the Company represent units of limited partnership interest in the Operating Partnership not held by the Company. The Company's financial position and results of operations are the same as those of the Operating Partnership. The noncontrolling interest for the consolidated entities under development or construction (see Note 1) was zero as of September 30, 2017 and December 31, 2016.

As of September 30, 2017, there were 17,570,512 Class A Units not held by the Company.

As partial consideration for the acquisition of Columbus Village, the Operating Partnership issued 1,000,000 Class B Units on July 10, 2015 and issued 275,000 Class C Units on January 10, 2017. The Class B Units were automatically converted to Class A Units on July 10, 2017. Subject to the occurrence of certain events, the Class C Units will not earn or accrue distributions until January 10, 2018, at which time they automatically will convert into Class A Units.

On January 10, 2017, the Operating Partnership issued 68,691 Class A Units to acquire the remaining 20% interest in the Town Center Phase VI project.

Common Stock Dividends and Class A Unit Distributions

On January 5, 2017, the Company paid cash dividends of $6.7 million to common stockholders and the Operating Partnership paid cash distributions of $3.0 million to holders of Class A Units.

On April 6, 2017, the Company paid cash dividends of $7.2 million to common stockholders and the Operating Partnership paid cash distributions of $3.2 million to holders of Class A Units.

On July 6, 2017, the Company paid dividends of $8.6 million to common stockholders and the Operating Partnership paid cash distributions of $3.1 million to holders of Class A Units.

On August 4, 2017, the Board of Directors declared a cash dividend and distribution of $0.19 per share and unit payable on October 5, 2017 to stockholders and unitholders of record on September 27, 2017.

Subsequent to September 30, 2017

On October 2, 2017, due to the request of holders of Class A Units to tender an aggregate of 358,879 units for redemption by the Operating Partnership, the Company elected to satisfy the redemption requests with an aggregate cash payment of $4.9 million.

On October 5, 2017, the Company paid dividends of $8.5 million to common stockholders and the Operating Partnership paid cash distributions of $3.3 million to holders of Class A Units.