Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Assets and Liabilities (Schedule of Changes in Carrying Value of Contingent Consideration) (Details)

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Fair Value of Assets and Liabilities (Schedule of Changes in Carrying Value of Contingent Consideration) (Details) - Contingent Consideration - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance of contingent consideration $ 2,104 $ 7,144
Payments (409) (5,021)
Change in fair value of contingent consideration 61 (19)
Ending balance of contingent consideration $ 1,756 $ 2,104