Income Taxes Income Taxes (Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Abstract]
Deferred Tax Assets, Operating Loss Carryforwards	$ 2,890	$ 3,480
Deferred Tax Assets, Tax Credit Carryforwards	7,600	1,461
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	821	977
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts	1,028	690
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	5,990	5,818
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Impairment Losses	355	460
Deferred Tax Assets, Gain On Sale Of Intangible Assets	137	137
Deferred Tax Assets, Deferred Income	270	587
Deferred Tax Assets, State Taxes	1,534	0
Deferred Tax Assets, Other	0	0
Deferred Tax Assets, Gross	20,625	13,610
Deferred Tax Assets, Valuation Allowance	(5,918)	(515)
Deferred Tax Assets, Net of Valuation Allowance	14,707	13,095
Deferred Tax Liabilities, State Taxes	0	(248)
Deferred Tax Liabilities, Property, Plant and Equipment	(84)	(2,361)
Deferred Tax Liabilities, Intangible Assets	(38,864)	(17,074)
Deferred Tax Liabilities, Prepaid Insurance	(224)	(284)
Deferred Tax Liabilities, Foreign Other	(5,018)	(442)
Deferred Tax Liabilities, Net	(44,190)	(20,409)
Deferred Tax Assets, Net	$ (29,483)	$ (7,314)