Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Summary Of Significant Accounting Policies [Abstract]

Rollforward Analysis of the Allowance Against Accounts Receivable Balance

	Year Ended December 31,
	2018		2017		2016
	(in thousands)
Allowance for bad debt
Balance at beginning of year	$	(7,033)	$	(5,211)	$	(4,221)
Bad debt recovery (charge)		77		(452)		(1,222)
Reclassification to leasehold costs related to signing bonus		4,197		—		—
Reclassification related to Sojitz acquisition		—		(694)		—
Foreign currency gain (loss)		224		(676)		232
Balance at end of period	$	(2,535)	$	(7,033)	$	(5,211)

Assets And Liabilities Measured On Recurring Basis

	As of December 31, 2018
	Level 1		Level 2		Level 3		Total
	(in thousands)
Recurring
Assets
Derivative asset commodity swaps	$	—	$	3,520	$	—	$	3,520
	$	—	$	3,520	$	—	$	3,520
Liabilities
SARs liability	$	—	$	1,632	$	—	$	1,632
	$	—	$	1,632	$	—	$	1,632
	As of December 31, 2017
	Level 1		Level 2		Level 3		Total
	(in thousands)
Recurring
Liabilities
SARs liability	$	—	$	146	$	—	$	146
	$	—	$	146	$	—	$	146