Revenue Recognition (Tables)

9 Months Ended

Sep. 30, 2018

Revenue Recognition

Schedule of sales to members

	Three Months				NineMonths
	Ended September 30,				Ended September 30,
	(dollars in thousands)
	2018		2017		2018		2017
Capacity revenues	$	219,597	$	220,347	$	691,649	$	687,725
Energy revenues		164,932		156,161		432,092		404,250
Total	$	384,529	$	376,508	$	1,123,741	$	1,091,975

Schedule of opening and closing balances of receivables from contracts with customers

	(dollars in thousands)
	September 30,		September 30,		December31,		December 31,
	2018		2017		2017		2016
Receivables from members	$	140,010	$	124,858	$	126,211	$	136,552