Components of Accumulated Other Comprehensive Loss Reclassifications (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Selling, general and administrative expenses		$ 58,463	$ 77,969	$ 122,365	$ 144,763
Income (loss) from continuing operations before income taxes and equity loss		22,178	(5,327)	47,186	13,230
Income tax expense		(7,105)	(4,843)	(19,960)	(10,154)
Net income (loss)		7,762	(12,598)	23,591	(985)
Amount Reclassified from Accumulated Other Comprehensive Loss | Cumulative Unrecognized Actuarial Losses on Pension Obligations
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income (loss) from continuing operations before income taxes and equity loss		5,519	4,490	11,053	8,949
Income tax expense		(469)	(359)	(939)	(718)
Net income (loss)		5,050	4,131	10,114	8,231
Amount Reclassified from Accumulated Other Comprehensive Loss | Actuarial losses
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Selling, general and administrative expenses	[1]	3,995	2,837	7,942	5,676
Cost of services and products sold	[1]	1,456	1,584	2,974	3,136
Amount Reclassified from Accumulated Other Comprehensive Loss | Prior service costs
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Selling, general and administrative expenses	[1]	31	23	62	46
Cost of services and products sold	[1]	37	46	75	91
Amount Reclassified from Accumulated Other Comprehensive Loss | Effective Portion of Deriviatives Designated as Hedging Instruments
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	[1]	0	0	0	(1)
Net income (loss)	[1]	1	0	2	1
Foreign currency forward exchange contracts | Amount Reclassified from Accumulated Other Comprehensive Loss | Effective Portion of Deriviatives Designated as Hedging Instruments
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cost of services and products sold	[1]	$ 1	$ 0	$ 2	$ 2

[1] These accumulated other comprehensive loss components are included in the computation of net periodic pension costs. See Note 10, Employee Benefit Plans, for additional details.