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Fair Value Measurements (Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation) (Details) (Contingent Consideration Liability [Member], USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Contingent Consideration Liability [Member]
    
Contingent consideration for acquisitions    
Balance at beginning of period $ (7,577) $ (9,856)
Additions for acquisitions (7,860) 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Payments 3,425 1,198
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements 0 0
Fair value adjustment 3,584 1,215
Foreign currency translation adjustment (99) (134)
Balance at end of period $ (8,527) $ (7,577)