Property and Equipment, Net - Depreciation Expense Table (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Depreciation Expense [Line Items]
Depreciation expense			$ 13,070	$ 12,870
Continuing Operations [Member]
Depreciation Expense [Line Items]
Depreciation expense	$ 6,840	$ 6,540	13,070	12,870
Cost of Sales [Member] | Continuing Operations [Member]
Depreciation Expense [Line Items]
Depreciation expense	6,470	6,030	12,360	11,840
Selling, General and Administrative Expenses [Member] | Continuing Operations [Member]
Depreciation Expense [Line Items]
Depreciation expense	$ 370	$ 510	$ 710	$ 1,030