Contingencies (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Industrial Assets Guaranteed Under Contract [Member]
Guarantor Obligations [Line Items]
Assets guaranteed under contract	$ 40,024	$ 3,813
Percentage of assets expected to be sold	87.00%	100.00%
Agricultural Assets Guaranteed Under Contract [Member]
Guarantor Obligations [Line Items]
Assets guaranteed under contract	$ 23,292	$ 11,415
Percentage of assets expected to be sold	90.00%	100.00%