Fair Value Measurements Level 4 (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	$ 143,787
Foreign Currency Contract, Asset, Fair Value Disclosure	0	[1]
Foreign Currency Contracts, Liability, Fair Value Disclosure	0	[1]
Investments, Fair Value Disclosure	2,823	[2]
Deferred Compensation Plan Assets, Fair Value	2,823	[2]
Long-term Debt, Fair Value	0	[3]
Business Acquisition, Contingent Consideration, at Fair Value	0	[4]
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0
Foreign Currency Contract, Asset, Fair Value Disclosure	126	[1]
Foreign Currency Contracts, Liability, Fair Value Disclosure	2,198	[1]
Investments, Fair Value Disclosure	0	[2]
Deferred Compensation Plan Assets, Fair Value	0	[2]
Long-term Debt, Fair Value	249,795	[3]
Business Acquisition, Contingent Consideration, at Fair Value	0	[4]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0
Foreign Currency Contract, Asset, Fair Value Disclosure	0	[1]
Foreign Currency Contracts, Liability, Fair Value Disclosure	0	[1]
Investments, Fair Value Disclosure	0	[2]
Deferred Compensation Plan Assets, Fair Value	0	[2]
Long-term Debt, Fair Value	0	[3]
Business Acquisition, Contingent Consideration, at Fair Value	9,195	[4]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	143,787
Foreign Currency Contract, Asset, Fair Value Disclosure	126	[1]
Foreign Currency Contracts, Liability, Fair Value Disclosure	2,198	[1]
Investments, Fair Value Disclosure	2,823	[2]
Deferred Compensation Plan Assets, Fair Value	2,823	[2]
Long-term Debt, Fair Value	210,000	[3]
Business Acquisition, Contingent Consideration, at Fair Value	$ 9,195	[4]

[1] The fair values of forward and swap contracts are based on period-end forward rates and reflect the value of the amount that we would pay or receive for the contracts involving the same notional amounts and maturity dates.

[2] We provide a domestic non-qualified deferred compensation plan covering certain employees, which allows for the deferral of compensation for an employee-specified term or until retirement or termination. Amounts deferred can be allocated to various hypothetical investment options. The Plan has been amended to disallow deferral elections in respect fiscal year 2013 and subsequent periods. We hold investments, primarily comprised of mutual funds, to satisfy the future obligations of the plan. Changes in the value of the investment accounts are recognized each period based on the fair value of the underlying investments. Employees making deferrals are entitled to receive distributions of their hypothetical account balances (amounts deferred, together with earnings (losses)).

[3] We estimate the fair value of our long-term debt using discounted cash flow analysis, based on our current incremental borrowing rates for similar types of borrowing arrangements.

[4] Contingent consideration obligations arise from prior business acquisitions. The fair values are based on discounted cash flow analyzes reflecting the possible achievement of specified performance measures or events and captures the contractual nature of the contingencies, commercial risk, and the time value of money. Contingent consideration obligations are classified in the consolidated balance sheets as accrued expense (short-term) and other liabilities (long-term), as appropriate based on the contractual payment dates.