Stockholders' Equity	9 Months Ended
Sep. 30, 2018
Equity [Abstract]
Stockholders' Equity	Stockholders' Equity Common Stock As of September 30, 2018 and December 31, 2017, the Company had 72.1 million and 67.3 million shares of Common Stock outstanding, respectively, excluding unvested restricted shares of Common Stock ("restricted shares") and long-term incentive plan units in the OP ("LTIP Units") issued in accordance with the OPP which are currently, or may be in the future, convertible into shares of Common Stock. During the second quarter of 2017, all outstanding limited partnership units in the OP ("OP Units") which were held by limited partners other than the Company, and totaled 181,841, were converted into Common Stock. On February 28, 2017, the Company completed a reverse stock split of Common Stock, OP Units and LTIP Units, at a ratio of 1-for-3, the impact of which was already reflected in the Company's Annual Report on Form 10-K filed with the SEC on February 28, 2018. Equity Distribution Agreement - Common Stock The Company has entered into an Equity Distribution Agreement with UBS Securities LLC, Robert W. Baird & Co. Incorporated, Capital One Securities, Inc., Mizuho Securities USA Inc., FBR Capital Markets & Co. and KeyBanc Capital Markets Inc. to sell shares of Common Stock, to raise aggregate sales proceeds of $175.0 million, from time to time, pursuant to an “at the market” equity offering program (the “ATM Program”). During the three and nine months ended September 30, 2018, the Company sold 164,927 shares of Common Stock through the 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 and 5,409,650 as authorized shares of its 7.25% Series A Cumulative Redeemable Preferred Stock, $0.01 par value per share ("Series A Preferred Stock"), as of September 30, 2018 and December 31, 2017, respectively. The Company had 5,416,890 and 5,409,650 shares of Series A Preferred Stock issued and outstanding, as of September 30, 2018 and December 31, 2017, respectively. Equity Distribution Agreement - Series A Preferred Stock In March 2018, the Company entered into an equity distribution agreement with Ladenburg Thalmann & Co. Inc., BMO Capital Markets Corp. and B. Riley FBR, Inc. to raise aggregate sales proceeds of $200.0 million from time to time pursuant to an ATM Program for its Series A Preferred Stock (the "Preferred Stock ATM Program"). 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. Monthly Dividends The Company generally pays dividends on Common Stock on the 15th day of each month (or, if not a business day, the next succeeding business day) to Common Stock holders 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. The Company's board of directors may alter the amounts of dividends paid or suspend dividend payments at any time 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. 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.

Stockholders' Equity

Common Stock

As of September 30, 2018 and December 31, 2017, the Company had 72.1 million and 67.3 million shares of Common Stock outstanding, respectively, excluding unvested restricted shares of Common Stock ("restricted shares") and long-term incentive plan units in the OP ("LTIP Units") issued in accordance with the OPP which are currently, or may be in the future, convertible into shares of Common Stock. During the second quarter of 2017, all outstanding limited partnership units in the OP ("OP Units") which were held by limited partners other than the Company, and totaled 181,841, were converted into Common Stock. On February 28, 2017, the Company completed a reverse stock split of Common Stock, OP Units and LTIP Units, at a ratio of 1-for-3, the impact of which was already reflected in the Company's Annual Report on Form 10-K filed with the SEC on February 28, 2018.

Equity Distribution Agreement - Common Stock

The Company has entered into an Equity Distribution Agreement with UBS Securities LLC, Robert W. Baird & Co. Incorporated, Capital One Securities, Inc., Mizuho Securities USA Inc., FBR Capital Markets & Co. and KeyBanc Capital Markets Inc. to sell shares of Common Stock, to raise aggregate sales proceeds of $175.0 million, from time to time, pursuant to an “at the market” equity offering program (the “ATM Program”). During the three and nine months ended September 30, 2018, the Company sold 164,927 shares of Common Stock through the 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 and 5,409,650 as authorized shares of its 7.25% Series A Cumulative Redeemable Preferred Stock, $0.01 par value per share ("Series A Preferred Stock"), as of September 30, 2018 and December 31, 2017, respectively. The Company had 5,416,890 and 5,409,650 shares of Series A Preferred Stock issued and outstanding, as of September 30, 2018 and December 31, 2017, respectively.

Equity Distribution Agreement - Series A Preferred Stock

In March 2018, the Company entered into an equity distribution agreement with Ladenburg Thalmann & Co. Inc., BMO Capital Markets Corp. and B. Riley FBR, Inc. to raise aggregate sales proceeds of $200.0 million from time to time pursuant to an ATM Program for its Series A Preferred Stock (the "Preferred Stock ATM Program"). 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.

Monthly Dividends

The Company generally pays dividends on Common Stock on the 15th day of each month (or, if not a business day, the next succeeding business day) to Common Stock holders 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. The Company's board of directors may alter the amounts of dividends paid or suspend dividend payments at any time 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.

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.