Property and Equipment, Net - Depreciation Expense Table (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Depreciation Expense [Line Items]
Depreciation expense	$ 7,050	$ 6,450
Continuing Operations [Member]
Depreciation Expense [Line Items]
Depreciation expense	7,050	6,450
Cost of Sales [Member] | Continuing Operations [Member]
Depreciation Expense [Line Items]
Depreciation expense	6,060	5,640
Selling, General and Administrative Expenses [Member] | Continuing Operations [Member]
Depreciation Expense [Line Items]
Depreciation expense	$ 990	$ 810