Income Taxes (Reconciliation of the Company's Effective Tax Rate to the Statutory Federal Rate) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory taxes	35.00%	35.00%	35.00%
State income taxes, net of federal tax benefit	1.70%	3.30%	3.60%
Foreign operations	(14.50%)	(16.80%)	(24.10%)
Permanent differences	1.20%	1.10%	2.80%
Tax credits	(7.10%)	(10.40%)	(23.90%)
Stock option compensation	0.10%	(0.40%)	1.20%
Effective income tax rate reconciliation, change in accruals for uncertain tax positions	1.40%	5.30%	8.80%
Effective tax rate, other	(0.40%)	0.10%	(1.90%)
Effective income tax rate, Total	17.40%	17.20%	1.50%