Equity - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2018	Feb. 28, 2018
Stockholders Equity Note [Line Items]
Net proceeds from issuance of common stock	$ 2,262,000	$ 182,512,000
Issuance of common stock	5,547,000	177,597,000
Direct stock purchase and dividend reinvestment plan		$ 6,307,000
Share Repurchase Plan, February 2018
Stockholders Equity Note [Line Items]
Common stock authorized to repurchase by Board				$ 100,000,000
Available authorization remaining for repurchase	$ 100,000,000
Convertible Debt Securities
Stockholders Equity Note [Line Items]
Securities excluded in the calculation of diluted earnings per share (in shares)	35,435,019
Equity awards
Stockholders Equity Note [Line Items]
Securities excluded in the calculation of diluted earnings per share (in shares)	21,249	7,376
At The Market Offerings | Common Stock
Stockholders Equity Note [Line Items]
Stock issuance program, authorized amount			$ 150,000,000
Issuance of common stock (in shares)	129,500
Net proceeds from issuance of common stock	$ 2,000,000
Remaining outstanding	$ 85,000,000
Common Stock
Stockholders Equity Note [Line Items]
Issuance of common stock (in shares)	350,088	11,500,000
Issuance of common stock	$ 3,000	$ 115,000
Direct stock purchase and dividend reinvestment plan (in shares)	0	399,838
Direct stock purchase and dividend reinvestment plan		$ 4,000