Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Summary of Significant Accounting Policies

Schedule of the Company sales to major customers (purchases in excess of 10% of total sales)

	2016		2017		2018
Company A	1	%	—	%	16	%
Company B	29		22		14
Company C	13		15		7
All others	57		63		63
	100	%	100	%	100	%

Reconciliation of basic weighted average shares outstanding to diluted weighted average shares outstanding

.  The following is a reconciliation of the Company’s basic weighted average shares outstanding to diluted weighted average shares outstanding during the periods presented (in thousands):

	Year Ended December 31,
	2016	2017	2018
Basic weighted average number of shares outstanding	294,945	315,426	316,036
Add: Dilutive effect of restricted stock units	—	817	—
Add: Dilutive effect of outstanding stock options	—	—	—
Add: Dilutive effect of performance stock units	—	40	—
Diluted weighted average number of shares outstanding	294,945	316,283	316,036
Weighted average number of outstanding equity awards excluded from calculation of diluted earnings per common share (1):
Restricted stock units	6,740	1,521	2,844
Outstanding stock options	702	676	626
Performance stock units	659	1,054	1,705

(1)    The potential dilutive effects of these awards were excluded from the computation of earnings (loss) per common share—assuming dilution because the inclusion of these awards would have been anti-dilutive.