Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2016

Receivables [Abstract]

Schedule Of Accounts Receivable

Accounts receivable consist of the following at December 31:

	2016			2015
Trade customers	$	827,721		$	438,538
Allowance for doubtful accounts	(17,991		)	(14,095		)
	809,730			424,443
Federal and state taxes	90,414			60,748
Other	38,599			23,341
Accounts receivable, net	$	938,743		$	508,532

Activity in Allowance for Doubtful Accounts

Activity in our allowance for doubtful accounts during the years ended December 31, 2016, 2015 and 2014 is set forth in the table below:

	Year Ended December 31,
	2016			2015			2014
Balance at Beginning of Year, January 1	$	14,095		$	13,468		$	11,741
Charged to Expense	4,095			956			301
Additions/(Deductions) (1)	(199		)	(329		)	1,426
Balance at End of Year, December 31	$	17,991		$	14,095		$	13,468

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(1) Deductions primarily represent accounts receivable written off during the period.