Components of Accumulated Other Comprehensive Loss Reclassifications (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Selling, general and administrative expenses	$ 55,141	$ 50,784
Interest Expense	11,653	12,363
Income (loss) from continuing operations before income taxes and equity income (loss)	16,767	(14,614)
Income tax expense	6,253	(2,166)
Net income (loss)	10,137	(9,592)
Amount Reclassified from Accumulated Other Comprehensive Loss
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense		(1,776)
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 income (loss)	5,520	4,650
Income tax expense	(522)	(517)
Net income (loss)	4,998	4,133
Amount Reclassified from Accumulated Other Comprehensive Loss | Effective Portion of Deriviatives Designated as Hedging Instruments
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net income (loss)	149	(300)
Amount Reclassified from Accumulated Other Comprehensive Loss | Actuarial losses
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Selling, general and administrative expenses	2,652	2,376
Cost of services and products sold	2,815	2,214
Amount Reclassified from Accumulated Other Comprehensive Loss | Prior service costs (benefits)
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Selling, general and administrative expenses	(12)	(1)
Cost of services and products sold	65	61
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]
Revenues	0	(408)
Cost of services and products sold	1	0
Income (loss) from continuing operations before income taxes and equity income (loss)	243	(465)
Income tax expense	(94)	165
Cross currency interest rate swaps | Amount Reclassified from Accumulated Other Comprehensive Loss | Effective Portion of Deriviatives Designated as Hedging Instruments
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest Expense	$ 242	$ (57)