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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Accounts and notes receivable, net of allowance for doubtful accounts	$ 1,036	$ 1,129
Preferred stock, par value			$ 0.01
Preferred stock, shares authorized			300,000,000
Preferred stock, shares issued			0
Common stock, par value			$ 0.01
Common stock, shares authorized			3,000,000,000
Common stock, shares issued	290,537,612	290,537,612

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For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

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