Other Equity Matters (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended	3 Months Ended
	Mar. 13, 2020	Mar. 12, 2019	Jan. 31, 2020	Mar. 31, 2020	Mar. 31, 2019	Apr. 21, 2020
Class of Stock [Line Items]
Treasury Stock, Value				$ 37,488	$ 83,293
Preferred Stock, Redemption Price Per Share				$ 25.00
Dividends	$ 37,100	$ 40,400
Cash dividends paid per share	$ 0.52	$ 0.52		0.52	$ 0.52
Common Stock [Member]
Class of Stock [Line Items]
Treasury Stock Acquired, Average Cost Per Share				$ 27.43
Treasury Stock, Carrying Basis				$ 37,500
Stock Repurchase Program, Remaining Authorized Repurchase Amount				46,100
Preferred Stock [Member]
Class of Stock [Line Items]
Cumulative unpaid preferred dividends				1,800
Series A Preferred Stock [Member]
Class of Stock [Line Items]
Dividends				$ 1,800
Preferred Stock, Dividends, Per Share, Cash Paid				$ 0.53125
Series C Preferred Stock [Member]
Class of Stock [Line Items]
Dividends				$ 3,200
Preferred Stock, Dividends, Per Share, Cash Paid				$ 0.4609375
Series D Preferred Stock [Member]
Class of Stock [Line Items]
Proceeds from Issuance of Preferred Stock, Preference Stock, and Warrants			$ 145,300
Preferred Units, Offering Costs			$ 4,700
Dividends				$ 1,500
Preferred Stock, Dividends, Per Share, Cash Paid				$ 0.24349
Series B Preferred Stock [Member]
Class of Stock [Line Items]
Dividends				$ 2,900
Preferred Stock, Dividends, Per Share, Cash Paid				$ 0.50
Subsequent Event [Member]
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount						$ 200,000