Additional Balance Sheet Detail and Supplemental Cash Flow Information Additional Balance Sheet Detail and Supplemental Cash Flow Information (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Supplemental Cash Flow Information [Abstract]
Capital Lease Obligations	45813	34604	32243
Extinguishment of Debt, Amount	$ 0	$ 0	$ 10,616
Noncash or Part Noncash Acquisition, Other Assets Acquired	110,273	131,833	0
Interest Paid, Excluding Capitalized Interest, Operating Activities	22,916	21,943	41,919
Income Taxes Paid	$ 50,400	$ 13,000	$ 17,181