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Acquisition and Divestiture - Sale of Corvisa LLC (Details) - Discontinued Operations, Disposed of by Sale - Corvisa LLC - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Jan. 06, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Membership interests, percentage				100.00%
Gain from release of escrow	$ 1,000	$ 0	$ 1,966

Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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