Income Taxes (Provision for Income Taxes from Continuing Operations Differs from the Federal Statutory Rate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Statutory rate, amount	$ 12,985	$ (29,664)	$ (291)
Intangible asset impairment, amount	0	26,637	7,241
State taxes, less federal effect, amount	1,845	606	1,382
Change in valuation allowance, amount	284	94	(2,268)
Federal tax credits, amount	(242)	(255)	(517)
Uncertain tax positions, amount	(344)	(169)	(515)
Foreign rate differential, amount	(6)	(311)	(163)
Non-deductible expenses, amount	(793)	173	(66)
Other, amount	(105)	(69)	(6)
Provision for income taxes	$ 13,624	$ (2,958)	$ 4,797
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory rate, percentage	35.00%	35.00%	35.00%
Intangible asset impairment, percentage	0.00%	(31.40%)	(870.30%)
State taxes, less federal effect, percentage	5.00%	(0.70%)	(166.10%)
Change in valuation allowance, percentage	0.70%	(0.10%)	272.60%
Federal tax credits, percentage	(0.70%)	0.30%	62.10%
Uncertain tax positions, percentage	(0.90%)	0.20%	61.90%
Foreign rate differential, percentage	0.00%	0.40%	19.60%
Non-deductible expenses, percentage	(2.10%)	(0.20%)	7.90%
Other, percentage	(0.30%)	0.00%	0.70%
Effective income tax rate, percentage	36.70%	3.50%	(576.60%)