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Basis Of Presentation (Narrative) (Details) - Accounting Standards Update 2016-09 [Member] - Impact Of Forfeitures On Compensation Cost [Member] $ in Thousands | 9 Months Ended
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Sep. 30, 2017 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Increase to additional paid in capital | $ 379
Increase to deferred tax assets | 141
Deferred Tax Assets [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Cumulative-effect adjustment | (141)
Retained Earnings [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Cumulative-effect adjustment | (238)
Additional Paid In Capital [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Cumulative-effect adjustment | $ 379

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