Income Taxes (Benefit of) Provision for Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Benefit of income taxes	$ 0	$ (239)	$ (26)
Deferred:
Total deferred	4,781	(7,105)	(4,893)
Provision for income taxes	16,136	14,943	16,264
Continuing Operations
Current:
U.S. Federal	9,402	16,882	14,703
State	3,144	2,479	2,987
Foreign	(1,191)	2,687	3,467
Total current	11,355	22,048	21,157
Deferred:
U.S. Federal	4,158	(7,466)	(5,404)
State	1,047	1,246	1,595
Foreign	(424)	(885)	(1,084)
Total deferred	4,781	(7,105)	(4,893)
Provision for income taxes	16,136	14,943	16,264
Discontinued Operations
Current:
U.S. Federal	0	219	24
State	0	20	2
Foreign	0	0	0
Benefit of income taxes	$ 0	$ 239	$ 26