Pension and Postretirement Benefits - Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2014 PensionFunds	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Assumed health care cost trend rate	7.50%	8.00%
Decrease in assumed health care cost trend rate	0.50%	0.50%
Effect of one percentage point increase on accumulated post retirement benefit obligation	$ 1,800,000
Effect of one percentage point increase in assumed health care cost trend rate on total service and interest cost components	100,000
Effect of one percentage point decrease in assumed health care cost trend rate on accumulated post retirement benefit obligation	1,500,000
Effect of one percentage point decrease in assumed health care cost trend rate on total service and interest cost components	100,000
Maximum percentage of funding status of plans in red zone	65.00%
Maximum percentage of funding status of plans in yellow zone	80.00%
Maximum percentage of funding status of plans in green zone	80.00%
Percentage of excess employer contributions	5.00%
Aggregate number of funds	41
Cost of other employee benefit plans	100,000	1,300,000	1,700,000
Funded Plans
Defined Benefit Plan Disclosure [Line Items]
Funded status	(4,814,000)	(2,563,000)
Amount expected to contribute in postretirement benefit plans	1,400,000
Unfunded Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Funded status	(11,127,000)	(10,536,000)
Amount expected to contribute in postretirement benefit plans	800,000
Foreign Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Estimated net actuarial loss for pension plans that is expected to be amortized	145,000	(248,000)	(201,000)
Net actuarial losses for the foreign funded plans (before tax)	4,000,000	3,800,000
Net actuarial losses for the foreign funded plans (after tax)	3,100,000	2,800,000
Net actuarial losses for the foreign unfunded plans (before tax)	407,000	367,000
Net actuarial losses for the foreign unfunded plans (after tax)	213,000	275,000
Foreign Pension Plans | Funded Plans
Defined Benefit Plan Disclosure [Line Items]
Funded status	(269,000)	100,000
Liabilities of funded plans		100,000
Foreign Pension Plans | Unfunded Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Funded status	(2,756,000)	(2,911,000)
Liabilities of unfunded plans	(2,800,000)	(2,900,000)
Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Estimated net actuarial loss for pension plans that is expected to be amortized	500,000
Estimated prior service credit for postretirement benefit plans	600,000
Amount expected to contribute in postretirement benefit plans	$ 1,100,000
Scenario Forecast
Defined Benefit Plan Disclosure [Line Items]
Assumed health care cost trend rate				500.00%