Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Income Tax Benefits
Balance at January 1,	$ 15,117	$ 14,745	$ 12,745
Additions based on income tax positions related to current year	1,165	152	0
Additions for income tax positions of prior years(1)	2,321	934	1,811
Additions from acquisition	0	0	608
Reductions for income tax positions of prior years	0	(706)	0
Statute of limitation expirations	(17)	(8)	(419)
Balance at December 31,	$ 18,586	$ 15,117	$ 14,745