Stockholders' Equity of the Company (Details) - USD ($)		1 Months Ended	6 Months Ended
	Jul. 22, 2019	Aug. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Class of Stock [Line Items]
Common stock, shares issued (in shares)			100,972,035		100,746,988
Shares issued, value			$ 1,010,000		$ 1,007,000
Proceeds from issuance of stock			$ 0	$ 124,147,000
Subsequent event [Member]
Class of Stock [Line Items]
Proceeds from issuance of stock	$ 354,300,000
Forward equity sale [Member]
Class of Stock [Line Items]
Price per share (in dollars per share)		$ 72.10
Shares issued, value		$ 360,500,000
Price per share, adjusted (in dollars per share)		$ 71.68
Forward equity sale [Member] | Subsequent event [Member]
Class of Stock [Line Items]
Proceeds from issuance of stock	$ 354,300,000
Common Stock [Member] | Subsequent event [Member]
Class of Stock [Line Items]
Number of shares issued (in shares)	5,000,000
Common Stock [Member] | Forward equity sale [Member]
Class of Stock [Line Items]
Number of shares issued (in shares)		5,000,000
Common Stock [Member] | Forward equity sale [Member] | Subsequent event [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				$ 500,000,000.0
At-The-Market Program [Member] | Common Stock [Member] | Forward equity sale [Member]
Class of Stock [Line Items]
Shares available for sale (in shares)			1,201,204
Price per share (in dollars per share)			$ 75.92
Common stock, shares issued (in shares)			447,466
At the market stock offering remaining amount available for issuance			$ 375,000,000.0