Employee Benefits - (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Cost Recognized	$ 2.8	$ 2.6	$ 2.2
Employee 401(K) profit sharing plan, maximum annual matching per employee, percent	50.00%
Employee 401(K) profit sharing plan, employer matching contribution, percent	6.00%
Europe [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Cost Recognized	$ 0.1