Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Supplemental Cash Flow Information [Abstract]
Capital lease obligations	$ 4,123	$ 24,879	$ 0
Non-cash extinguishment of senior notes	53,373	0	0
Non-cash acquisitions and related deferred taxes	297,821	0	317,826
Interest paid	42,264	30,691	14,139
Income taxes paid	$ 1,937	$ 20,198	$ 26,585