Stockholders' Equity Additional Details (Details) - USD ($)	6 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Preferred Stock, Shares Authorized	2,000,000	2,000,000	2,000,000
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01	$ 0.01
Proceeds from issuance of common stock, net of expenses		$ 60,980,000	$ 0	$ 0
Common Stock Shares Issued At The Market		700,000
Shares Issued Price Per Share - At The Market		$ 82.93
Proceeds From Issuance Of Common Stock - At The Market		$ 61,000,000.0
Fees on Equity Issuance - At The Market		1,500,000
Stock Issued During Period, Shares, Dividend Reinvestment Plan	300,000
Stock Issued During Period, Value, Dividend Reinvestment Plan	$ 86.12
Proceeds from Issuance of Common Stock, Dividend Reinvestment Plan	$ 22,000,000.0	22,627,000
Maximum [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Proceeds from Stock Plans		$ 75,000,000.0