Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		5 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Nov. 30, 2019
Common stock.
Gross proceeds from issuance of shares	$ 149,521	$ 160,858
At the market
Common stock.
Shares issued and sold	4,127,800		9,154,166
Weighted average share price	$ 36.22		$ 38.18
Gross proceeds from issuance of shares	$ 149,500		$ 349,500
Sales agents' commissions	(800)		(2,700)
Other offering expenses	(100)		(400)
Net proceeds from issuance of common stock	$ 148,600		$ 346,400
2019 ATM Program
Common stock.
Shares issued and sold	4,127,800		9,154,166
Weighted average share price	$ 36.22		$ 38.18
Gross proceeds from issuance of shares	$ 149,500		$ 349,500
Sales agents' commissions	(800)		(2,700)
Other offering expenses	(100)		(400)
Net proceeds from issuance of common stock	$ 148,600		$ 346,400
2018-2 ATM Program
Common stock.
Maximum value of shares that can be offered and sold				$ 900,000