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Other Equity Matters (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Aug. 01, 2018
Class of Stock [Line Items]        
Stock Repurchased During Period, Value $ 978 $ 822    
Preferred Stock, Liquidation Preference Per Share $ 25.00      
Preferred Stock, Annual Dividend Amount $ 2.125      
Preferred Stock, Shares Issued 3,450,000   0  
Proceeds from Issuance of Preferred Stock, Preference Stock, and Warrants $ 86,300      
Preferred Units, Offering Costs $ 3,200      
Preferred Stock, Redemption Price Per Share $ 25.00      
Preferred Stock, Voting Rights 0      
Common Stock [Member]        
Class of Stock [Line Items]        
Stock Repurchase Program, Authorized Amount       $ 200,000
Treasury Stock Acquired, Average Cost Per Share $ 31.56      
Stock Repurchased During Period, Value $ 83,300      
Stock Repurchase Amount $ 141,000      
Treasury Stock [Member]        
Class of Stock [Line Items]        
Treasury shares acquired, shares 2,637,000      
Redeemable Preferred Stock [Member]        
Class of Stock [Line Items]        
Offering Amount, Interest Rate, Stated Percentage 8.50%      
Offering Amount, Interest Rate, Stated Percentage 8.50%