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Fair Value (Level 3 Fair Value Measurements Using Significant Other Unobservable Inputs for Acquisition-Related Contingent Consideration) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Fair Value [Abstract]    
Beginning Balance $ 37,098 $ 41,176
Amounts acquired
Changes in fair value included in earnings (4,078)
Ending Balance $ 37,098 $ 37,098