Segment and Geographic Information - Fixed Assets Less Accumulated Depreciation by Geographic Area (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total fixed assets less accumulated deprecation by geographic area	$ 73,572,000	$ 86,585,000
Impairment of long-lived assets	0	36,553,000	$ 0
North America
Segment Reporting Information [Line Items]
Total fixed assets less accumulated deprecation by geographic area	56,566,000	67,283,000
Europe
Segment Reporting Information [Line Items]
Total fixed assets less accumulated deprecation by geographic area	2,095,000	1,140,000
Latin America
Segment Reporting Information [Line Items]
Total fixed assets less accumulated deprecation by geographic area	14,826,000	18,067,000
Middle East
Segment Reporting Information [Line Items]
Total fixed assets less accumulated deprecation by geographic area	73,000	36,000
Other
Segment Reporting Information [Line Items]
Total fixed assets less accumulated deprecation by geographic area	$ 12,000	$ 59,000