Common Share Capitalization (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	7 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Jun. 13, 2018
Common Stock Capitalization [Line Items]
Dividends declared (in usd per share)		$ 1.64	$ 1.76
Payments of Dividends		$ (50,736)	$ (57,636)
Common Shares Issued And Outstanding Upon Conversion of All Convertible Securities	30,529,972	30,529,972	32,680,917
Stock Repurchase Program, Number of Shares Authorized to be Repurchased				1,550,000
Shares repurchased	361,090	1,547,148	961,566
Stock Repurchased and Retired During Period, Value	$ 5,500	$ 23,131	$ 14,642
Stock Repurchases, Average Price Per Share	$ 15.34	$ 14.95