Goodwill and Other Intangible Assets - Other Intangible Assets Amortization Expense (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Amortization of Intangible Assets [Line Items]
Amortization of intangible assets	$ 23,710	$ 19,770	$ 19,820
Continuing Operations [Member]
Amortization of Intangible Assets [Line Items]
Amortization of intangible assets	23,710	19,770	19,820
Continuing Operations [Member] | Cost of Sales [Member] | Technology and Other [Member]
Amortization of Intangible Assets [Line Items]
Amortization of intangible assets	5,310	4,870	4,940
Continuing Operations [Member] | Selling, General and Administrative Expenses [Member] | Customer Relationships [Member]
Amortization of Intangible Assets [Line Items]
Amortization of intangible assets	$ 18,400	$ 14,900	$ 14,880