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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, 2018	Dec. 31, 2017
Retirement Benefits, Description [Abstract]
Service cost	$ 155	$ 184
Interest cost	148	131
Amortization of prior years' unrecognized loss	177	244
Total	480	559
Net loss (gain)	276	(555)
Total expense recognized in net periodic benefit cost and other comprehensive income	$ 756	$ 4

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Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss.

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