Goodwill and Other Intangible Assets (Rollforward of Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Balance at beginning of year	$ 160,427	$ 137,890	$ 137,890
Additions	0	22,537	0
Balance at end of year	$ 160,427	$ 160,427	$ 137,890