Fair Value of Financial Instruments Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash surrender value of life insurance contracts	$ 3,450	$ 3,394
Foreign currency forward contracts	(1,119)	(647)
Contingent consideration liability	(6,556)	(7,594)
Total	(4,225)	(4,847)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash surrender value of life insurance contracts	0	0
Foreign currency forward contracts	0	0
Contingent consideration liability	0	0
Total	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash surrender value of life insurance contracts	3,450	3,394
Foreign currency forward contracts	(1,119)	(647)
Contingent consideration liability	0	0
Total	2,331	2,747
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash surrender value of life insurance contracts	0	0
Foreign currency forward contracts	0	0
Contingent consideration liability	(6,556)	(7,594)
Total	$ (6,556)	$ (7,594)
Continuous Computing [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business Combination, Contingent Consideration Arrangements, Measurement Period After Close Date	36 months