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Property and Equipment, Net - Depreciation Expense Table (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Depreciation Expense [Line Items]      
Depreciation expense $ 26,950 $ 24,390 $ 22,570
Continuing Operations [Member]      
Depreciation Expense [Line Items]      
Depreciation expense 26,950 24,390 22,570
Cost of Sales [Member] | Continuing Operations [Member]      
Depreciation Expense [Line Items]      
Depreciation expense 24,950 21,620 19,730
Selling, General and Administrative Expenses [Member] | Continuing Operations [Member]      
Depreciation Expense [Line Items]      
Depreciation expense $ 2,000 $ 2,770 $ 2,840