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Other Equity Matters (Details) - USD ($) $ / shares in Units, $ in Thousands			12 Months Ended
	Sep. 22, 2017	Sep. 12, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common shares, net of underwriting discount			$ 0	$ 0	$ 192,931
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, New Issues		6,152,500
Treasury Stock, Carrying Basis			220,100	$ 58,100
Stock Repurchase Program, Remaining Authorized Repurchase Amount			$ 83,600
Treasury Stock Acquired, Average Cost Per Share			$ 31.82	$ 31.34
Issuance of common shares, net of underwriting discount	$ 192,900
Sale of Stock, Price Per Share		$ 32.75
Treasury Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury Stock, Shares, Acquired			6,918,197	1,853,148