Income Taxes Schedule of Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Returns and Allowances	$ 188	$ 242
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation	3,064	3,230
Deferred Tax Assets, Inventory	364	1,796
Deferred Tax Assets, Operating Loss Carryforwards	22,689	26,273
Deferred Tax Assets, Deferred Income	273	214
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	2,166	1,923
Deferred Income Tax Asset Uncertain Tax Positions	1,052	577
Deferred Tax Assets, Other	1,848	1,686
Deferred Tax Assets, Gross	31,644	35,941
Deferred Tax Liabilities, Deferred Expense	(823)	(493)
Deferred Tax Liabilities, Property, Plant and Equipment	(17,236)	(18,103)
Deferred Tax Liabilities, Goodwill and Intangible Assets, Intangible Assets	(6,169)	(9,320)
Deferred Tax Liabilities, Other	(97)	(505)
Deferred Tax Liabilities	(24,325)	(28,421)
Valuation Allowance, Amount	(361)
Deferred Tax Assets (Liabilities), Net	6,958	7,520
Deferred Tax Assets, Net, Current	3,704	4,647
Deferred Tax Assets, Net, Noncurrent	5,366	4,140
Deferred Tax Liabilities, Noncurrent	$ (2,112)	$ (1,267)