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Equity (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2012
Dec. 31, 2018
Common Stock Repurchase        
Repurchase of common stock authorized by Board of Directors     $ 100,000,000 $ 60,000,000
Number of years for repurchase of common stock     5 years  
Common stock repurchased, value $ 317,000 $ 10,183,000    
Weighted average price per share (in dollars per share) $ 41.34      
Remaining authorized stock repurchase amount $ 59,700,000      
Dividend rate (as a percent) 6.50%      
Preferred stock dividends paid $ 800,000 $ 900,000    
Common Stock        
Common Stock Repurchase        
Common stock repurchased (in shares) 7,671 297,000    
Common stock repurchased, value   $ 2,000