Other Employee Benefit Programs Defined Contribution Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 9,521	$ 9,532	$ 10,400
United States Postretirement Benefit Plan of US Entity [Member] | G&W 401k savings plan [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	4.00%
Foreign Postretirement Benefit Plan [Member] | Canadian Retirement Benefit Plan 1 [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	6.00%
Foreign Postretirement Benefit Plan [Member] | Canadian retirement benefit plan 2 [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	5.00%
Foreign Postretirement Benefit Plan [Member] | Australian retirement benefit plan [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	9.50%	9.50%	9.50%