Equity - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Mar. 31, 2020	Dec. 31, 2018	Feb. 28, 2018
Stockholders Equity Note [Line Items]
Net proceeds from issuance of common stock			$ 5,791,000	$ 426,970,000
Direct stock purchase and dividend reinvestment plan				$ 6,307,000
Common stock repurchased, amount	$ 21,659,000		21,659,000
Share Repurchase Plan, February 2018
Stockholders Equity Note [Line Items]
Common stock authorized to repurchase by Board							$ 100,000,000
Common stock repurchased (in shares)	3,047,335
Common stock repurchased, amount	$ 22,000,000
Available authorization remaining for repurchase	$ 78,000,000		$ 78,000,000
Convertible Debt Securities
Stockholders Equity Note [Line Items]
Securities excluded in the calculation of diluted earnings per share (in shares)			32,225,825
Equity awards
Stockholders Equity Note [Line Items]
Securities excluded in the calculation of diluted earnings per share (in shares)	13,560	11,710	15,457	9,361
At The Market Offerings | Common Stock
Stockholders Equity Note [Line Items]
Stock issuance program, authorized amount					$ 175,000,000	$ 150,000,000
Issuance of common stock (in shares)			129,500
Net proceeds from issuance of common stock			$ 2,000,000
Remaining outstanding	$ 110,000,000		$ 110,000,000
Common Stock
Stockholders Equity Note [Line Items]
Issuance of common stock (in shares)		14,375,000	350,088	26,666,191
Direct stock purchase and dividend reinvestment plan (in shares)			0	399,838
Direct stock purchase and dividend reinvestment plan				$ 4,000
Common stock repurchased (in shares)	3,047,335		3,047,335
Common stock repurchased, amount	$ 30,000		$ 30,000