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Statements of Cash Flow	9 Months Ended
Statements of Cash Flow	Sep. 30, 2018
Supplemental Cash Flow Elements [Abstract]
Statements of Cash Flow	Statements of Cash Flow Interest payments were $137,789,000 and $134,291,000 and income taxes paid were $173,000,000 and $182,487,000 in the nine months ended September 30, 2018 and 2017, respectively.