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Statements of Cash Flow
6 Months Ended
Jun. 30, 2018
Supplemental Cash Flow Elements [Abstract]  
Statements of Cash Flow
Statements of Cash Flow
Interest payments were $72,878,000 and $72,528,000 and income taxes paid were $111,000,000 and $145,123,000 in the six months ended June 30, 2018 and 2017, respectively.