Equity (Details) - USD ($)	1 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Common Stock Repurchase
Repurchase of common stock authorized by Board of Directors	$ 100,000,000.0				$ 60,000,000.0
Number of years for repurchase of common stock	5 years
Common stock repurchased, value		$ 4,383,000	$ 3,567,000	$ 14,567,000
Weighted average price per share (in dollars per share)			$ 49.29
Remaining authorized stock repurchase amount			$ 56,400,000
Dividend rate (as a percent)			6.50%
Preferred stock dividends paid			$ 2,500,000	$ 2,400,000
Common Stock
Common Stock Repurchase
Common stock repurchased (in shares)		128,000	72,324	425,000
Common stock repurchased, value		$ 1,000	$ 1,000	$ 4,000