Income Taxes (Benefit of) Provision for Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
(Benefit of) provision for income taxes	$ (26)	$ (16)	$ (19)
Deferred:
Total deferred	(4,893)	(2,051)	(6,640)
Provision for income taxes	16,264	13,624	(2,958)
Continuing Operations
Current:
U.S. Federal	14,703	12,294	1,684
State	2,987	2,010	1,265
Foreign	3,467	1,371	733
Total current	21,157	15,675	3,682
Deferred:
U.S. Federal	(5,404)	(178)	(6,373)
State	1,595	273	(203)
Foreign	(1,084)	(2,146)	(64)
Total deferred	(4,893)	(2,051)	(6,640)
Provision for income taxes	16,264	13,624	(2,958)
Discontinued Operations
Current:
U.S. Federal	(24)	(15)	(18)
State	(2)	(1)	(1)
Foreign	0	0	0
(Benefit of) provision for income taxes	$ (26)	$ (16)	$ (19)