Stockholders' Equity of the Company (Details) - USD ($)	Aug. 08, 2018	Aug. 01, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018
Class of Stock [Line Items]
Common stock, shares issued (in shares)			100,967,024	100,746,988
Shares issued, value			$ 1,010,000	$ 1,007,000
Forward equity sale [Member]
Class of Stock [Line Items]
Price per share (in dollars per share)	$ 72.10
Shares issued, value	$ 360,500,000
Forward equity sale [Member] | Scenario, forecast [Member]
Class of Stock [Line Items]
Price per share (in dollars per share)		$ 71.68
Common Stock [Member] | Forward equity sale [Member]
Class of Stock [Line Items]
Number of shares issued (in shares)	5,000,000
At-The-Market Program [Member]
Class of Stock [Line Items]
At the market stock offering aggregate gross sales price of common stock					$ 500,000,000
At-The-Market Program [Member] | Common Stock [Member] | Forward equity sale [Member]
Class of Stock [Line Items]
Shares available for sale (in shares)			875,494
Common stock, shares issued (in shares)			447,466
Price per share (in dollars per share)			$ 75.75
At the market stock offering remaining amount available for issuance			$ 399,900,000