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Common and Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended			3 Months Ended		6 Months Ended	12 Months Ended
	Dec. 30, 2019	Apr. 30, 2019	Sep. 30, 2018	Jun. 30, 2017	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jul. 31, 2019	Mar. 31, 2019	May 31, 2018	Mar. 31, 2018
Class of Stock [Line Items]
Common Stock, Shares Authorized		90,000,000			90,000,000			90,000,000	90,000,000			45,000,000
Proceeds From Issuance Of Common Stock								$ 472,746	$ 339,744	$ 222,695
Preferred stock, par value (in dollars per share)					$ 0.0001			$ 0.0001	$ 0.0001
Preferred stock, shares authorized					4,000,000			4,000,000	4,000,000
Series A Junior Participating Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Redesignated of Shares Authorized								200,000
Common Stock [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues				2,415,000				7,993,519	6,507,263	4,786,604
Proceeds From Issuance Of Common Stock				$ 108,000
Common Stock [Member] | Forward Contracts Two [Member]
Class of Stock [Line Items]
Common Stock, Shares Authorized			3,500,000
Common Stock [Member] | Forward Sale Agreement [Member]
Class of Stock [Line Items]
Common Stock, Shares Authorized		3,162,500												3,450,000
Stock Issued During Period, Shares, New Issues		3,450,000
Proceeds From Issuance Of Common Stock	$ 195,800	$ 186,000
ATM Program [Member] | Common Stock [Member]
Class of Stock [Line Items]
Forward Contract Indexed to Issuer's Equity, Shares					2,003,118
At-Market Equity Program [Member] | Common Stock [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues							886,768		3,057,263
Proceeds From Issuance Of Common Stock							$ 59,300		$ 181,200
Value Of Equity Instruments To Be Issued					$ 0			$ 0					$ 250,000
Common stock Average Price							$ 66.83		$ 59.28
At-Market Equity Program Two [Member] | Common Stock [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues						444,228
Proceeds From Issuance Of Common Stock						$ 33,000
Gross Amount Remaining To Be Issued					$ 220,100			$ 220,100
Common stock Average Price						$ 74.30
At-Market Equity Program Two [Member] | ATM Program [Member] | Common Stock [Member]
Class of Stock [Line Items]
Value Of Equity Instruments To Be Issued											$ 400,000
Over-Allotment Option [Member] | Common Stock [Member] | Forward Sale Agreement [Member]
Class of Stock [Line Items]
Common Stock, Shares Authorized														450,000
Common Stock [Member] | Forward Sale Agreement [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues			3,450,000
Proceeds From Issuance Of Common Stock			$ 160,200

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