Fair Value of Financial Instruments Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
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	$ 2,346	$ 3,398
Deferred Compensation Liability, Current	(1,111)	(1,395)
Foreign currency forward contracts	(65)	(297)
Contingent consideration liability	(1,801)	(2,541)
Total	(631)	(835)
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
Deferred Compensation Liability, Current	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	2,346	3,398
Deferred Compensation Liability, Current	(1,111)	(1,395)
Foreign currency forward contracts	(65)	(297)
Contingent consideration liability	0	0
Total	1,170	1,706
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
Deferred Compensation Liability, Current	0	0
Foreign currency forward contracts	0	0
Contingent consideration liability	(1,801)	(2,541)
Total	$ (1,801)	$ (2,541)
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