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Supplemental Cash Flow Information	6 Months Ended
Supplemental Cash Flow Information	Jun. 30, 2016
Supplemental Cash Flow Elements [Abstract]
Supplemental Cash Flow Information	Supplemental Cash Flow Information. Cash paid, net of refunds, during the six months ended June 30, 2016 and 2015 for income taxes was $24.5 million and $43.6 million, respectively. Cash paid during the six months ended June 30, 2016 and 2015 for interest was $7.2 million and $6.9 million, respectively.