Components of Accumulated Other Comprehensive Loss (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Revenues	$ 1,848,399	$ 1,534,033	$ 1,204,369
Interest expense	(63,235)	(58,196)	(34,024)
Income (loss) from discontinued businesses	(25,863)	20,350	52,937
Total costs and expenses	1,760,023	1,537,339	1,127,966
Income from continuing operations before income taxes	37,506	(54,220)	31,065
Income Tax Expense (Benefit)	9,089	(8,673)	12,728
Net income (loss)	(2,729)	21,975	(512,218)
Other Operating Income (Expense), Net	3,722	(10,072)	$ 8,194
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	24,167	25,405
Income Tax Expense (Benefit)	(1,432)	(2,659)
Net income (loss)	22,735	22,746
Reclassification out of Accumulated Other Comprehensive Income [Member] | Pension asset transfer - discontinued businesses
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of services and products sold	0	5,363
Reclassification out of Accumulated Other Comprehensive Income [Member] | Settlement/curtailment losses
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Pension and Other Postretirement Benefits Cost (Reversal of Cost)	0	18
Reclassification out of Accumulated Other Comprehensive Income [Member] | Settlement/curtailment losses | Discontinued Operations
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Pension and Other Postretirement Benefits Cost (Reversal of Cost)	(72)	(110)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Actuarial losses
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Pension and Other Postretirement Benefits Cost (Reversal of Cost)	23,657	19,623
Other Operating Income (Expense), Net	0	12,906
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)	(970)	(992)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Pension and Other Postretirement Benefits Cost (Reversal of Cost)	582	511
Reclassification out of Accumulated Other Comprehensive Income [Member] | Foreign currency exchange forward contracts | Effective Portion of Derivatives Designated as Hedging Instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Revenues	(129)	(1,026)
Income from continuing operations before income taxes	3,345	2,578
Net income (loss)	2,375	1,586
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	0	(1,015)
Reclassification out of Accumulated Other Comprehensive Income [Member] | 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	$ (3,474)	$ (2,589)