Stockholders' Equity	9 Months Ended
Stockholders' Equity	Sep. 30, 2019
Equity [Abstract]
Stockholders' Equity	Stockholders' Equity Common Stock As of September 30, 2019 and December 31, 2018, the Company had 89.5 million and 76.1 million shares of Common Stock outstanding, respectively, excluding unvested restricted stock units in respect of shares of Common Stock (“RSUs”) and long-term incentive plan units of limited partner interest in the OP (“LTIP Units”). LTIP Units may be convertible into shares of Common Stock in the future. ATM Program — Common Stock The Company has an “at the market” equity offering program (the “Common Stock ATM Program”) pursuant to which the Company may sell shares of Common Stock, from time to time through its sales agents. During the three months ended March 31, 2019, the Company sold 7,759,322 shares of Common Stock through the ATM Program for gross proceeds of $152.8 million, before commissions paid of $1.5 million and additional issuance costs of $0.8 million. Following these sales, the Company had raised all $175.0 million contemplated by its existing equity distribution agreement related to the Common Stock ATM Program. In February 2019, the Company terminated its existing equity distribution agreement and entered into a new equity distribution agreement with substantially the same sales agents on substantially the same terms. During the three months ended September 30, 2019, the Company sold 5,596,452 shares of Common Stock under the new equity distribution agreement for gross proceeds of $109.9 million, before commissions paid of $1.6 million and additional issuance costs of $0.2 million. In total, during the nine months ended September 30, 2019, the Company sold 13,555,774 shares of Common Stock for gross proceeds of $262.6 million, before commissions paid of $3.1 million and additional issuance costs of $1.0 million. During the three and nine months ended September 30, 2018, the Company sold 164,927 shares of Common Stock through the Common Stock ATM Program for gross proceeds of $3.5 million, before commissions paid of $35,140 and additional issuance costs of $0.3 million. Underwriting Agreement - Common Stock On August 20, 2018, the Company completed the issuance and sale of 4,600,000 shares of Common Stock (including 600,000 shares issued and sold pursuant to the underwriters' exercise of their option to purchase additional shares in full) in an underwritten public offering at a price per share of $20.65. The gross proceeds from this offering were $95.0 million before deducting the underwriting discount of $3.8 million and additional offering expenses of $0.3 million. Preferred Stock The Company is authorized to issue up to 16,670,000 shares of Preferred Stock, of which it has classified and designated 13,409,650 as authorized shares of its Series A Preferred Stock as of September 30, 2019 and December 31, 2018. The Company had 6,682,448 and 5,416,890 shares of Series A Preferred Stock issued and outstanding, as of September 30, 2019 and December 31, 2018, respectively. ATM Program — Series A Preferred Stock In March 2018, the Company established an “at the market” equity offering program for its Series A Preferred Stock (the “Preferred Stock ATM Program”) pursuant to which the Company may raise aggregate sales proceeds of $200.0 million through sales of shares of Series A Preferred Stock from time to time through its sales agents. During the three months ended September 30, 2019, the Company sold 724,600 shares of Series A Preferred Stock through the Preferred Stock ATM Program for gross proceeds of $18.5 million, before commissions paid of approximately $0.3 million and additional issuance costs of approximately $0.1 million. During the nine months ended September 30, 2019, the Company sold 1,265,558 shares of Series A Preferred Stock through the Preferred Stock ATM Program for gross proceeds of $32.3 million, before commissions paid of approximately $0.5 million and additional issuance costs of approximately $0.2 million. During the three months ended September 30, 2018, the Company sold 3,225 shares of Series A Preferred Stock through the Preferred Stock ATM Program for gross proceeds of $81,009, before commissions paid of $1,215 and additional issuance costs of $0.1 million. During the nine months ended September 30, 2018, the Company sold 7,240 shares of Series A Preferred Stock through the Preferred Stock ATM Program for gross proceeds of $0.2 million, before commissions paid of $2,724 and additional issuance costs of $0.4 million. On November 8, 2019, the Company delivered a notice to the agents under the Preferred Stock ATM Program terminating the equity distribution agreement related to the Preferred Stock ATM Program effective on November 12, 2019. See Note 14 — Subsequent Events for additional information. Dividends Common Stock Dividends Historically, and through March 31, 2019, the Company generally paid dividends on Common Stock on the 15th day of each month (or, if not a business day, the next succeeding business day) to common stockholders of record on the applicable record date during the month at an annualized rate of $2.13 per share or $0.1775 per share on a monthly basis. Prior to July 2018, the record date for the Company’s regular dividend was generally the 8thday of the applicable month. On April 5, 2019, the Company’s board of directors approved a change in the Company’s Common Stock dividend policy. Accordingly, consistent with its peers, the Company anticipates paying future dividends authorized by its board of directors on shares of its Common Stock on a quarterly basis in arrears on the 15th day of the first month following the end of each fiscal quarter (unless otherwise specified) to common stockholders of record on the record date for such payment. This change affects the frequency of dividend payments only, and does not impact the annualized dividend rate on Common Stock of $2.13. The Company’s board of directors may alter the amounts of dividends paid or suspend dividend payments at any time prior to declaration and therefore dividend payments are not assured. For purposes of the presentation of information herein, the Company may refer to distributions by the OP on OP Units and LTIP Units as dividends. In addition, see Note 5 — Credit Facilities for additional information on the restrictions on the payment of dividends and other distributions imposed by the Credit Facility. Preferred Stock Dividend Dividends on Series A Preferred Stock accrue in an amount equal to $0.453125 per share per quarter to Series A Preferred Stock holders, which is equivalent to 7.25% of the $25.00 liquidation preference per share of Series A Preferred Stock per annum. Dividends on the Series A Preferred Stock are payable quarterly in arrears on the 15th day of January, April, July and October of each year (or, if not on a business day, on the next succeeding business day) to holders of record at the close of business on the record date set by the Company’s board of directors, which must be not more than 30 nor fewer than 10 days prior to the applicable payment date.