Property and Equipment, Net - Depreciation Expense Table (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Depreciation Expense [Line Items]
Depreciation expense	$ 6,230	$ 6,330
Continuing Operations [Member]
Depreciation Expense [Line Items]
Depreciation expense	6,230	6,330
Cost of Sales [Member] | Continuing Operations [Member]
Depreciation Expense [Line Items]
Depreciation expense	5,890	5,810
Selling, General and Administrative Expenses [Member] | Continuing Operations [Member]
Depreciation Expense [Line Items]
Depreciation expense	$ 340	$ 520