Supplemental Cash Flow Information Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Supplemental Cash Flow Information [Abstract]
Capital Lease Obligations	$ 32,243	$ 4,123	$ 24,879
Non-cash extinguishment of senior notes	10,616	53,373	0
Non-cash acquisitions and related deferred taxes	0	297,821	0
Interest paid	41,976	42,264	30,691
Income taxes paid	$ 17,181	$ 1,937	$ 20,198