Property and Equipment, Net - Depreciation Expense Table (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Depreciation Expense [Line Items]
Depreciation expense	$ 24,390	$ 22,570	$ 21,380
Continuing Operations [Member]
Depreciation Expense [Line Items]
Depreciation expense	24,390	22,570	21,380
Cost of Sales [Member] | Continuing Operations [Member]
Depreciation Expense [Line Items]
Depreciation expense	21,620	19,730	18,450
Selling, General and Administrative Expenses [Member] | Continuing Operations [Member]
Depreciation Expense [Line Items]
Depreciation expense	$ 2,770	$ 2,840	$ 2,930