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Employee Benefit Plan (Tables)

12 Months Ended

Dec. 31, 2017

Employee Benefit Plans [Abstract]

Unrealized Gains (Losses) On Trading Securities Held In Rabbi Trust



	Year ended December 31,
	2017			2016			2015
Unrealized gains (losses) on trading securities held in rabbi trust	$	1,520		$	586		$	(571)



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Tabular disclosure of unrealized gains and losses on investments.

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