Property and Equipment, Net - Depreciation Expense Table (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Depreciation Expense [Line Items]
Depreciation expense	$ 32,770	$ 30,810	$ 25,050
Continuing Operations [Member]
Depreciation Expense [Line Items]
Depreciation expense	32,760	30,790	25,020
Cost of Sales [Member] | Continuing Operations [Member]
Depreciation Expense [Line Items]
Depreciation expense	28,030	26,410	21,520
Selling, General and Administrative Expenses [Member] | Continuing Operations [Member]
Depreciation Expense [Line Items]
Depreciation expense	$ 4,730	$ 4,380	$ 3,500