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International Retirement Plan (Components of Net Periodic Benefit Costs and Other Amounts Recognized in Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Retirement Benefits [Abstract]
Service cost	$ 166	$ 155	$ 184
Interest cost	151	148	131
Amortization of actuarial loss	200	177	244
Total net periodic pension cost	517	480	559
Other changes in plan assets and benefit obligations recognized in other comprehensive income:
Net loss (gain)	1,815	453	(558)
Amortization of prior years' unrecognized loss	(200)	(177)	(244)
Tax (benefit) provision	(555)	(88)	247
Total recognized as accumulated other comprehensive income (loss)	1,060	188	(555)
Total expense recognized in net periodic benefit cost and other comprehensive income	$ 1,577	$ 668	$ 4

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