Fair Value Measurements (Intangible Assets Measured At Fair Value On A Non-Recurring Basis) (Details) - Contingent consideration [Member] $ in Thousands	Dec. 31, 2017 USD ($)
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Liabilities, Fair Value Disclosure, Nonrecurring	$ 316
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Liabilities, Fair Value Disclosure, Nonrecurring	0
Fair Value Inputs Level 3 [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Liabilities, Fair Value Disclosure, Nonrecurring	316
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Liabilities, Fair Value Disclosure, Nonrecurring	$ 0