Common Stock	12 Months Ended
Dec. 31, 2018
Stockholders' Equity Note [Abstract]
Stockholders' Equity Note Disclosure [Text Block]	Note 5 – Common Stock In June 2017, the Company filed an automatic shelf registration statement on Form S-3, registering an unspecified amount of common stock, preferred stock, depositary shares and warrants at an indeterminant aggregate initial offering price. The Company may periodically offer one or more of these securities in amounts, prices and on terms to be announced when and if these securities are offered. The specifics of any future offerings, along with the use of proceeds of any securities offered, will be described in detail in a prospectus supplement, or other offering materials, at the time of any offering. In June 2017, the Company completed a follow-on underwritten offering of 2,415,000 shares of common stock. The offering, which included the full exercise of the overallotment option by the underwriters, raised net proceeds of approximately $108.0 million, after deducting the underwriting discount. The proceeds from the offering were used to repay borrowings under our revolving credit facility to fund property acquisitions and for general corporate purposes. In May 2018, the Company entered into a $250.0 million at-the-market equity program (“ATM program”) through which the Company may, from time to time, sell shares of common stock. In addition to selling shares of common stock, the Company may enter into forward sale agreements through its ATM Program. During the year ended December 31, 2018, the Company issued 3,057,263 shares of common stock under its ATM program at an average price of $59.28, realizing gross proceeds of approximately $181.2 million. The Company had approximately $68.8 million remaining under the ATM program as of December 31, 2018. In March 2018, the Company completed a follow-on public offering of 3,450,000 shares of common stock, which included the underwriters’ option to purchase an additional 450,000 shares of common stock, in connection with a forward sale agreement. The offering, which included the full exercise of the underwriters’ option to purchase additional shares, was settled in its entirety in September 2018. Upon settlement the Company issued 3,450,000 shares and received net proceeds of $160.2 million after deducting fees and expenses. In September 2018, the Company entered into a follow-on public offering of 3,500,000 shares of common stock in connection with a forward sale agreement. As of December 31, 2018, the Company has not received proceeds from the sale of shares of its common stock by the forward purchaser. Selling common stock through the forward sale agreement enabled the Company to set the price of such shares upon pricing the offering (subject to certain adjustments) while delaying the issuance of such shares and the receipt of the net proceeds by the Company. The forward sale agreement is required to be settled no later than September 3, 2019.

Note 5 – Common Stock

In June 2017, the Company filed an automatic shelf registration statement on Form S-3, registering an unspecified amount of common stock, preferred stock, depositary shares and warrants at an indeterminant aggregate initial offering price. The Company may periodically offer one or more of these securities in amounts, prices and on terms to be announced when and if these securities are offered. The specifics of any future offerings, along with the use of proceeds of any securities offered, will be described in detail in a prospectus supplement, or other offering materials, at the time of any offering.

In June 2017, the Company completed a follow-on underwritten offering of 2,415,000 shares of common stock. The offering, which included the full exercise of the overallotment option by the underwriters, raised net proceeds of approximately $108.0 million, after deducting the underwriting discount. The proceeds from the offering were used to repay borrowings under our revolving credit facility to fund property acquisitions and for general corporate purposes.

In May 2018, the Company entered into a $250.0 million at-the-market equity program (“ATM program”) through which the Company may, from time to time, sell shares of common stock. In addition to selling shares of common stock, the Company may enter into forward sale agreements through its ATM Program.

During the year ended December 31, 2018, the Company issued 3,057,263 shares of common stock under its ATM program at an average price of $59.28, realizing gross proceeds of approximately $181.2 million. The Company had approximately $68.8 million remaining under the ATM program as of December 31, 2018.

In March 2018, the Company completed a follow-on public offering of 3,450,000 shares of common stock, which included the underwriters’ option to purchase an additional 450,000 shares of common stock, in connection with a forward sale agreement. The offering, which included the full exercise of the underwriters’ option to purchase additional shares, was settled in its entirety in September 2018. Upon settlement the Company issued 3,450,000 shares and received net proceeds of $160.2 million after deducting fees and expenses.

In September 2018, the Company entered into a follow-on public offering of 3,500,000 shares of common stock in connection with a forward sale agreement. As of December 31, 2018, the Company has not received proceeds from the sale of shares of its common stock by the forward purchaser. Selling common stock through the forward sale agreement enabled the Company to set the price of such shares upon pricing the offering (subject to certain adjustments) while delaying the issuance of such shares and the receipt of the net proceeds by the Company. The forward sale agreement is required to be settled no later than September 3, 2019.