Accumulated Other Comprehensive Loss (Reclassifications Out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Schedule of Reclassifciations Out of Accumulated Other Comprehensive Income [Line Items]
Income (loss) before income taxes		$ (19,590)	$ (2,292)
Income tax provision (benefit)		5,442	310
Net income (loss)		(14,148)	(1,982)
Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
Schedule of Reclassifciations Out of Accumulated Other Comprehensive Income [Line Items]
Net income (loss)	[1]	11,631	(168)
Reclassifications Out of Accumulated Other Comprehensive Income (Loss) | Defined Benefit Plan Items
Schedule of Reclassifciations Out of Accumulated Other Comprehensive Income [Line Items]
Amortization of prior-service cost	[2]	(228)	(228)
Income (loss) before income taxes		(228)	(228)
Income tax provision (benefit)		57	60
Net income (loss)		(171)	$ (168)
Reclassifications Out of Accumulated Other Comprehensive Income (Loss) | Cash Flow Hedges
Schedule of Reclassifciations Out of Accumulated Other Comprehensive Income [Line Items]
Interest payments	[3]	182
Income (loss) before income taxes		182
Income tax provision (benefit)		(46)
Net income (loss)		136
Reclassifications Out of Accumulated Other Comprehensive Income (Loss) | Foreign Currency Translation Adjustment
Schedule of Reclassifciations Out of Accumulated Other Comprehensive Income [Line Items]
Realized loss on pre-existing investment		11,666
Income (loss) before income taxes		11,666
Income tax provision (benefit)		0
Net income (loss)		$ 11,666

[1] Amounts in parentheses indicate credits to profit/loss

[2] This accumulated other comprehensive loss component is included in the computation of net periodic benefit cost (see Note 6).

[3]