Income Taxes (Tables)

6 Months Ended

Jun. 30, 2018

Income Taxes [Abstract]

Provision for Income Taxes

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
Provision for income taxes	$	(126)	$	(153)	$	(250)	$	(87)
Effective tax rate		14.6%		25.8%		62.7%		14.2%