The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

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Preparation of Interim Financial Statements and Other Items - Components of income (loss) before income tax (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Components of income (loss) before income taxes
Income before income taxes	$ 46,239	$ 16,887	$ 74,299	$ 21,895
Pre-IPO
Components of income (loss) before income taxes
Domestic			13,370
Foreign			512
Post-IPO
Components of income (loss) before income taxes
Domestic	43,898		57,629
Foreign	$ 2,341		$ 2,788