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Organization and Significant Accounting Policies, Long-Lived Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Long-Lived Assets [Abstract]      
Charges related to write-down of intangible assets $ 0.8 $ 2.3 $ 1.9