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Fair Value Measurements Fair Value Measurements - Level 3 Activity (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Contingent consideration, balance at $ 19,000  
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Contingent Consideration [Member]
    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Contingent consideration, balance at 38,646 22,510
Additions from acquisitions 16,875 24,885
Payments (6,008) (9,065)
(Gain)/loss included in earnings (11,463) 253
Reversals (19,129)  
Foreign currency translation 62 63
Contingent consideration, balance at 18,983 38,646
Cost of Sales [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Contingent Consideration [Member]
    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
(Gain)/loss included in earnings (6,700)  
General, Administrative, Integration, and Other [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Contingent Consideration [Member]
    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
(Gain)/loss included in earnings $ (4,800)