Income Taxes (Summary of Income Tax Contingencies) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Abstract]
Balance as of January 1	$ 3,481	$ 3,645	$ 3,839
Tax positions related to the current year:
Additions			31
Tax positions related to prior years:
Reductions	(32)	(165)	(176)
Expiration of statutes of limitation, increase		1
Expiration of statutes of limitation			(49)
Balance as of December 31	$ 3,449	$ 3,481	$ 3,645