Discontinued Operations - Carrying Amount of Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total current assets of discontinued operations	$ 0	$ 17,456
Total current liabilities of discontinued operations	0	17,107
Discontinued Operations | LOEN
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Trade accounts receivable, net	0	17,456
Total current assets of discontinued operations	0	17,456
Accounts payable	0	15,836
Accrued and other current liabilities	0	1,271
Total current liabilities of discontinued operations	$ 0	$ 17,107