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Organization and Basis of Presentation Share Repurchase Program (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2017	May 05, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Stock repurchase program, authorized amount		$ 100.0
Stock repurchase program, remaining authorized repurchase amount	$ 98.5

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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No definition available.

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