Stockholders' Equity of the Company	3 Months Ended
Mar. 31, 2019
Equity [Abstract]
Stockholders' Equity of the Company	Stockholders’ Equity of the Company At-The-Market Stock Offering Program Under our at-the-market stock offering program, which commenced in June 2018, we may offer and sell shares of our common stock having an aggregate gross sales price up to $500.0 million from time to time in “at-the-market” offerings. In connection with the at-the-market program, the Company may enter into forward equity sale agreements with certain financial institutions acting as forward purchasers whereby, at our discretion, the forward purchasers may borrow and sell shares of our common stock under our at-the-market program. The use of a forward equity sale agreement allows the Company to lock in a share price on the sale of shares of our common stock at the time the agreement is executed but defer settling the forward equity sale agreements and receiving the proceeds from the sale of shares until a later date. During the three months ended March 31, 2019, we executed 12-month forward equity sale agreements with financial institutions acting as forward purchasers under our at-the-market stock offering program to sell 875,494 shares of common stock at a weighted average sales price of $75.75 per share before underwriting discounts, commissions and offering expenses. The Company did not receive any proceeds from the sale of its common shares by the forward purchasers. The Company currently expects to fully physically settle the forward equity sale agreements and receive cash proceeds upon one or more settlement dates, at the Company’s discretion, prior to the final settlement dates under the forward equity sale agreements in March and April 2020, in which case we expect to receive aggregate net cash proceeds at settlement equal to the number of shares specified in such forward equity sale agreement multiplied by the relevant forward price per share. The weighted average forward sale price that we expect to receive upon physical settlement of the agreements will be subject to adjustment for (i) a floating interest rate factor equal to a specified daily rate less a spread, (ii) the forward purchasers’ stock borrowing costs and (iii) scheduled dividends during the term of the agreements. We have not settled any portion of these forward equity sale agreements as of the date of this filing. Upon physical settlement, the Company will contribute the net proceeds from the issuance of shares of our common stock to the Operating Partnership in exchange for an equal number of units in the Operating Partnership. Since commencement of the program, we have completed sales of 447,466 shares of common stock through March 31, 2019 and 875,494 shares have been sold by forward purchasers under forward equity sale agreements, which have not been settled as of the date of this filing. We did not settle any forward sales of common stock under our at-the-market program during the three months ended March 31, 2019 and as of March 31, 2019, approximately $399.9 million remains available to be sold under this program. Actual future sales will depend upon a variety of factors, including but not limited to, market conditions, the trading price of the Company’s common stock and our capital needs. We have no obligation to sell the remaining shares available for sale under this program. Forward Equity Sale Agreements In August 2018, the Company entered into forward equity sale agreements with certain financial institutions acting as forward purchasers in connection with an offering of 5,000,000 shares of common stock at an initial gross offering price of $360.5 million, or $72.10 per share, before underwriting discounts, commissions and offering expenses. The forward purchasers borrowed and sold an aggregate of 5,000,000 shares of common stock in the offering. The Company did not receive any proceeds from the sale of its shares of common stock by the forward purchasers at the time of the offering. The Company currently expects to fully physically settle the forward sale agreements and receive cash proceeds upon one or more settlement dates, at the Company’s discretion, prior to the final settlement date under the forward sale agreements of August 1, 2019, in which case we expect to receive aggregate net cash proceeds at settlement equal to the number of shares specified in such forward equity sale agreement multiplied by the relevant forward price per share. The forward sale price that we expect to receive upon physical settlement of the agreements, which was initially $71.68 per share, will be subject to adjustment for (i) a floating interest rate factor equal to a specified daily rate less a spread, (ii) the forward purchasers’ stock borrowing costs and (iii) scheduled dividends during the term of the forward equity sale agreements. We have not settled any portion of these forward equity sale agreements as of the date of this filing. Upon physical settlement, the Company will contribute the net proceeds from the issuance of shares of our common stock to the Operating Partnership in exchange for an equal number of units in the Operating Partnership.

Stockholders’ Equity of the Company

At-The-Market Stock Offering Program

Under our at-the-market stock offering program, which commenced in June 2018, we may offer and sell shares of our common stock having an aggregate gross sales price up to $500.0 million from time to time in “at-the-market” offerings. In connection with the at-the-market program, the Company may enter into forward equity sale agreements with certain financial institutions acting as forward purchasers whereby, at our discretion, the forward purchasers may borrow and sell shares of our common stock under our at-the-market program. The use of a forward equity sale agreement allows the Company to lock in a share price on the sale of shares of our common stock at the time the agreement is executed but defer settling the forward equity sale agreements and receiving the proceeds from the sale of shares until a later date.

During the three months ended March 31, 2019, we executed 12-month forward equity sale agreements with financial institutions acting as forward purchasers under our at-the-market stock offering program to sell 875,494 shares of common stock at a weighted average sales price of $75.75 per share before underwriting discounts, commissions and offering expenses. The Company did not receive any proceeds from the sale of its common shares by the forward purchasers. The Company currently expects to fully physically settle the forward equity sale agreements and receive cash proceeds upon one or more settlement dates, at the Company’s discretion, prior to the final settlement dates under the forward equity sale agreements in March and April 2020, in which case we expect to receive aggregate net cash proceeds at settlement equal to the number of shares specified in such forward equity sale agreement multiplied by the relevant forward price per share. The weighted average forward sale price that we expect to receive upon physical settlement of the agreements will be subject to adjustment for (i) a floating interest rate factor equal to a specified daily rate less a spread, (ii) the forward purchasers’ stock borrowing costs and (iii) scheduled dividends during the term of the agreements. We have not settled any portion of these forward equity sale agreements as of the date of this filing. Upon physical settlement, the Company will contribute the net proceeds from the issuance of shares of our common stock to the Operating Partnership in exchange for an equal number of units in the Operating Partnership.

Since commencement of the program, we have completed sales of 447,466 shares of common stock through March 31, 2019 and 875,494 shares have been sold by forward purchasers under forward equity sale agreements, which have not been settled as of the date of this filing. We did not settle any forward sales of common stock under our at-the-market program during the three months ended March 31, 2019 and as of March 31, 2019, approximately $399.9 million remains available to be sold under this program. Actual future sales will depend upon a variety of factors, including but not limited to, market conditions, the trading price of the Company’s common stock and our capital needs. We have no obligation to sell the remaining shares available for sale under this program.

Forward Equity Sale Agreements

In August 2018, the Company entered into forward equity sale agreements with certain financial institutions acting as forward purchasers in connection with an offering of 5,000,000 shares of common stock at an initial gross offering price of $360.5 million, or $72.10 per share, before underwriting discounts, commissions and offering expenses. The forward purchasers borrowed and sold an aggregate of 5,000,000 shares of common stock in the offering. The Company did not receive any proceeds from the sale of its shares of common stock by the forward purchasers at the time of the offering. The Company currently expects to fully physically settle the forward sale agreements and receive cash proceeds upon one or more settlement dates, at the Company’s discretion, prior to the final settlement date under the forward sale agreements of August 1, 2019, in which case we expect to receive aggregate net cash proceeds at settlement equal to the number of shares specified in such forward equity sale agreement multiplied by the relevant forward price per share. The forward sale price that we expect to receive upon physical settlement of the agreements, which was initially $71.68 per share, will be subject to adjustment for (i) a floating interest rate factor equal to a specified daily rate less a spread, (ii) the forward purchasers’ stock borrowing costs and (iii) scheduled dividends during the term of the forward equity sale agreements. We have not settled any portion of these forward equity sale agreements as of the date of this filing. Upon physical settlement, the Company will contribute the net proceeds from the issuance of shares of our common stock to the Operating Partnership in exchange for an equal number of units in the Operating Partnership.