Goodwill and Other Intangible Assets - Other Intangible Assets Amortization Expense (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Amortization of Intangible Assets [Line Items]
Amortization of intangible assets	$ 19,820	$ 14,530	$ 14,100
Continuing Operations [Member]
Amortization of Intangible Assets [Line Items]
Amortization of intangible assets	19,820	14,510	14,090
Continuing Operations [Member] | Cost of Sales [Member] | Technology and Other [Member]
Amortization of Intangible Assets [Line Items]
Amortization of intangible assets	4,940	3,490	3,580
Continuing Operations [Member] | Selling, General and Administrative Expenses [Member] | Customer Relationships [Member]
Amortization of Intangible Assets [Line Items]
Amortization of intangible assets	$ 14,880	$ 11,020	$ 10,510