Retirement and Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2017

Retirement Benefits [Abstract]

Schedule of weighted average assumption rates

The weighted average assumption rates used for benefit obligations were as follows:

	Year Ended December 31,
	2017	2016
Discount rate:
United States Plans	3.00% - 3.50%	1.00% - 4.00%
International Plans	1.60% - 6.75%	1.90% - 7.50%
Rate of Compensation Increase:
United States Plans	—	—
International Plans	2.00% - 3.50%	2.00% - 3.50%