Property and Equipment, Net - Depreciation Expense Table (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Depreciation Expense [Line Items]
Depreciation expense	$ 6,330	$ 5,800
Continuing Operations [Member]
Depreciation Expense [Line Items]
Depreciation expense	6,330	5,800
Cost of Sales [Member] | Continuing Operations [Member]
Depreciation Expense [Line Items]
Depreciation expense	5,810	5,200
Selling, General and Administrative Expenses [Member] | Continuing Operations [Member]
Depreciation Expense [Line Items]
Depreciation expense	$ 520	$ 600