Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of unrecognized tax benefits
Balance at Beginning of Period	$ 4,461,000	$ 1,640,000	$ 1,571,000
Additions based on tax positions related to the current year	0	0	1,290,000
Additions for tax positions of prior years	298,000	0	341,000
Additions from current year acquisitions	0	4,121,000	0
Reductions for tax positions of prior years	0	(1,290,000)	0
Reductions as a result of a lapse of applicable statutes of limitations	(175,000)	(10,000)	(1,562,000)
Balance at End of Period	$ 4,584,000	$ 4,461,000	$ 1,640,000