Stockholders' Equity (Details) $ / shares in Units, $ in Thousands		12 Months Ended
	May 15, 2019 USD ($) sales_agent	Dec. 31, 2019 USD ($) item $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares
Changes In Equity And Comprehensive Income Line Items [Line Items]
Common stock, shares authorized (in shares)		500,000,000	500,000,000
Common stock, par value (in dollars per share) | $ / shares		$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)		50,000,000	50,000,000
Preferred stock, par value (in dollars per share) | $ / shares		$ 0.01	$ 0.01
Common stock, shares issued (in shares)		129,534,407	127,103,750
Common stock, shares outstanding (in shares)		129,534,407	127,103,750
Preferred stock, shares issued (in shares)		0	0
Preferred stock, shares outstanding (in shares)		0	0
Number of votes, common stockholder rights | item		1
Number of sales agents | sales_agent	9
Average share price (in dollars per share) | $ / shares		$ 106.57
“At the market” equity program
Changes In Equity And Comprehensive Income Line Items [Line Items]
Aggregate offering price | $	$ 500,000
Common stock sold (in shares)		1,779,200	933,789
Average share price (in dollars per share) | $ / shares		$ 113.19	$ 97.93
Net proceeds from sale of stock | $		$ 198,827	$ 90,531
Available for issuance | $		$ 298,621