Property and Equipment, Net - Depreciation Expense Table (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Depreciation Expense [Line Items]
Depreciation expense			$ 18,630	$ 18,890
Continuing Operations [Member]
Depreciation Expense [Line Items]
Depreciation expense	$ 5,760	$ 5,840	18,630	18,890
Cost of Sales [Member] | Continuing Operations [Member]
Depreciation Expense [Line Items]
Depreciation expense	5,490	5,440	17,330	17,380
Selling, General and Administrative Expenses [Member] | Continuing Operations [Member]
Depreciation Expense [Line Items]
Depreciation expense	$ 270	$ 400	$ 1,300	$ 1,510