Supplemental Cash Flow Information Interest and Taxes Paid(Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Supplemental Cash Flow Information [Abstract]
Interest, net	$ 65,884	$ 59,564	$ 43,076
Income taxes	$ 45,738	$ 44,807	$ 36,179