Retirement Savings Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
United States Pension Plans of US Entity, Defined Benefit
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Contribution per employee, percent	20.00%
Employee contribution percentage	4.00%
Employer contributions	$ 1.8	$ 1.7	$ 1.3
Foreign Pension Plans, Defined Benefit
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Employer contributions	$ 1.5	$ 1.2	$ 1.1