Employee Retirement Benefit Plans (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Retirement Benefit Plans (Textual) [Abstract]
Maximum employee annual contributions, percent	100.00%
US Based Employees
Employee Retirement Benefit Plans (Textual) [Abstract]
Total contributions under plans	$ 9.7	$ 9.0	$ 8.9
Non US Based Employees
Employee Retirement Benefit Plans (Textual) [Abstract]
Total contributions under plans	$ 4.8	$ 4.6	$ 3.2