Commitments and Contingencies - Narrative (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Minimum [Member]	Dec. 31, 2012 Maximum [Member]	Mar. 05, 2013 Pending Litigation [Member]
Loss Contingencies [Line Items]
Operating Leases, Rent Expense, Net	$ 0	$ 0	$ 0
Designated Royalty Period, Payments Due Period				30 days	45 days
Designated Royalty Period				3 months	6 months
Royalty Expense	3.8	4.2	3.2
Loss Contingency, Range of Possible Loss, Minimum						0.3
Loss Contingency, Range of Possible Loss, Maximum						0.6
Loss Contingency, Estimate of Possible Loss						$ 0.5