Issuance of Common Shares (Details)
$ in Thousands

6 Months Ended

Jun. 30, 2019

USD ($)

shares

Jun. 30, 2018

USD ($)

Dec. 31, 2018

shares

Class of Stock [Line Items]

Common Shares, shares authorized

15,000,000

Common Stock, Shares, Issued

80,677,733

77,226,443

Net proceeds from issuance of common shares | $

$ 231,407

$ 530

Common And Preferred Shares Disclosure [Text Block]

On June 3, 2019, the Company filed a shelf registration statement with the SEC, which is effective for a term of three years. The securities covered by this registration statement include common shares, preferred shares, debt securities, depositary shares, warrants, and units. The Company may periodically offer one of 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.

Additionally, on June 3, 2019, the Company filed a shelf registration statement with the SEC, which is effective for a term of three years, for its Dividend Reinvestment and Direct Share Purchase Plan (DSPP) which permits the issuance of up to 15,000,000 common shares.

During the six months ended June 30, 2019, the Company issued an aggregate of 3,098,130 common shares under its DSPP for net proceeds of $236.6 million.

shelf registration effective term

3

direct share purchase plan [Member]

Class of Stock [Line Items]

Common Stock, Shares, Issued

3,098,130

Net proceeds from issuance of common shares | $

$ 236,600