Employee Retirement Plans (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) agreement employee	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 1,685	$ 1,961	$ 2,179	$ 2,478
Net liability	$ 1,893	2,116	$ 2,328
Number of employees | employee	2,628
Employees represented by unions through CBAs, percentage	12.00%
Number of CBA's to be negotiated | agreement	3
Number of CBA's | agreement	6
Company's maximum contribution percentage	5.00%
Sheet Metal Workers Pension Plan Of Northern California [Member]
Defined Benefit Plan Disclosure [Line Items]
CBAs expiration date	Jun. 30, 2016
Sheet Metal Workers National Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
CBAs expiration date	Apr. 10, 2016
National Integrated Group Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
CBAs expiration date	Apr. 01, 2016
Foreign Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 362	410
Pre-tax accumulated other comprehensive loss - retirement benefit liability adjustment	91	113
Net liability	$ 271	$ 297