Income Taxes (Details 3)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure - Income Taxes - Additional Information [Abstract]
Statutory federal tax rate	35.00%	35.00%	35.00%
Foreign rate differential	(11.60%)	(10.40%)	(3.80%)
Foreign, federal and state income tax credits	(2.20%)	(2.70%)	(2.90%)
State taxes	1.00%	0.30%	2.20%
Non-deductible expenses	0.50%	0.70%	(1.20%)
Other	0.00%	(0.10%)	(0.90%)
Effective tax rate	22.70%	22.80%	28.40%