Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements Fair Value Measurements (Fair Value, Liabilities Measured on a Recurring Basis, Unobservable Input Reconciliation) (Details)

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Fair Value Measurements Fair Value Measurements (Fair Value, Liabilities Measured on a Recurring Basis, Unobservable Input Reconciliation) (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Fair Value Disclosures [Abstract]        
Fair Value of the contingent consideration liability $ 1,072 $ 4,492 $ 1,032 $ 6,832
Accretion 40 243    
Payments 0 2,583    
Fair value adjustments $ 0 $ 0