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Fair Value Measurements (Reconciliation of Level 3 Liabilities) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Change in fair value of the contingent purchase price liability $ (19) $ 5,497 $ (132) $ 5,327
Unobservable Inputs (Level 3)        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance Liabilities     1,095  
Change in fair value of the contingent purchase price liability     132  
Ending Balance Liabilities $ 1,227   $ 1,227