Components of Accumulated Other Comprehensive Loss (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Selling, general and administrative expenses	$ 234,673	$ 200,391	$ 242,112
Interest Expense	47,552	51,584	46,804
Total costs and expenses	1,464,263	1,387,754	1,634,556
Income from continuing operations before income taxes and equity loss	95,451	(79,471)	34,815
Income Tax Expense (Benefit)	83,803	6,637	27,678
Net Loss	(11,844)	79,753	$ (6,332)
Total amounts reclassified from accumulated other comprehensive loss in connection with loss on dilution and sale of equity method investment		(28,743)
Cumulative Unrecognized Actuarial Losses on Pension Obligations
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total amounts reclassified from accumulated other comprehensive loss in connection with loss on dilution and sale of equity method investment		1,534
Effective Portion of Derivatives Designated as Hedging Instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total amounts reclassified from accumulated other comprehensive loss in connection with loss on dilution and sale of equity method investment		(1,636)
Cumulative Foreign Exchange Translation Adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total amounts reclassified from accumulated other comprehensive loss in connection with loss on dilution and sale of equity method investment		(28,641)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total before tax		45,565
Income Tax Expense (Benefit)		(16,822)
Total amounts reclassified from accumulated other comprehensive loss in connection with loss on dilution and sale of equity method investment		(28,743)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Cumulative Unrecognized Actuarial Losses on Pension Obligations
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total costs and expenses	22,204	18,102
Income Tax Expense (Benefit)	(2,093)	(2,091)
Net Loss	20,111	16,011
Reclassification out of Accumulated Other Comprehensive Income [Member] | Amortization of Actuarial Losses
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Selling, general and administrative expenses	10,174	8,490
Cost of services and products sold	11,811	9,005
Reclassification out of Accumulated Other Comprehensive Income [Member] | Amortization of Prior Service Costs
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Selling, general and administrative expenses	(58)	(11)
Cost of services and products sold	277	263
Reclassification out of Accumulated Other Comprehensive Income [Member] | Settlement/Curtailment Losses [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Selling, general and administrative expenses	0	355
Reclassification out of Accumulated Other Comprehensive Income [Member] | Effective Portion of Derivatives Designated as Hedging Instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income Tax Expense (Benefit)	(118)	147
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total before tax		45,405
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total before tax		2,593
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total before tax		(2,433)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Foreign Exchange Forward | Effective Portion of Derivatives Designated as Hedging Instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Revenues	(936)	(408)
Cost of services and products sold	(18)	(2)
Income from continuing operations before income taxes and equity loss	48	(410)
Net Loss	(70)	(263)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Cross currency interest rate swaps | Effective Portion of Derivatives Designated as Hedging Instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Interest Expense	1,002
Reclassification out of Accumulated Other Comprehensive Income [Member] | Foreign Exchange Contract [Member] | Cumulative Foreign Exchange Translation Adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Other Expenses	0	1,157
Income Tax Expense (Benefit)	0	0
Net Loss	$ 0	$ 1,157