Leases Operating Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Leased Assets [Line Items]
Assets Subleased to a Third party	$ 26,005	$ 15,603
Operating Leases, Rent Expense	108,698	$ 109,789	$ 111,257
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Operating Leases, Future Minimum Payments Due, Current	103,325
Operating Leases, Future Minimum Payments, Due in Two Years	64,520
Operating Leases, Future Minimum Payments, Due in Three Years	37,272
Operating Leases, Future Minimum Payments, Due in Four Years	27,722
Operating Leases, Future Minimum Payments, Due in Five Years	26,816
Operating Leases, Future Minimum Payments, Due Thereafter	80,692
Operating Leases, Future Minimum Payments Due	340,347
Discontinued Operations [Member]
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Operating Leases, Future Minimum Payments Due, Current	4,496
Operating Leases, Future Minimum Payments, Due in Two Years	2,992
Operating Leases, Future Minimum Payments, Due in Three Years	1,701
Operating Leases, Future Minimum Payments, Due in Four Years	627
Operating Leases, Future Minimum Payments, Due in Five Years	0
Operating Leases, Future Minimum Payments, Due Thereafter	0
Operating Leases, Future Minimum Payments Due	9,816
333131 Mining Machinery and Equipment Manufacturing [Member]
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Operating Leases, Future Minimum Payments Due, Current	40,299
Operating Leases, Future Minimum Payments, Due in Two Years	13,819
Operating Leases, Future Minimum Payments, Due in Three Years	6,909
Operating Leases, Future Minimum Payments, Due in Four Years	0
Operating Leases, Future Minimum Payments, Due in Five Years	0
Operating Leases, Future Minimum Payments, Due Thereafter	0
Operating Leases, Future Minimum Payments Due	$ 61,027