Income Taxes (Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate) (Details)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Statutory rate									35.00%	35.00%	35.00%
State taxes, net of Federal tax benefit									1.00%	2.00%	2.00%
Foreign tax expense and tax rate differential									1.60%	0.60%	0.40%
Research and development tax credit									0.00%	(0.70%)	(0.50%)
Domestic Production Activities Deduction									(0.60%)	(0.70%)	0.00%
Valuation allowance on capital losses and PA loss carryforwards									(0.30%)	0.00%	0.00%
Domestic Production Activities Deduction, prior years, net									0.00%	(1.50%)	0.00%
Effective Income Tax Rate Reconciliation, Tax Contingencies									0.50%	0.40%	0.20%
Effective Income Tax Rate Reconciliation, Other Adjustments									(0.30%)	0.10%	(0.10%)
Effective Income Tax Rate, Continuing Operations, Total	35.00%	39.00%	36.60%	37.20%	34.70%	33.80%	34.70%	37.10%	36.90%	35.20%	37.00%
Effective Income Tax Rate Reconciliation, Tax Contingencies, Domestic									0.15%	0.25%	0.14%
Effective Income Tax Rate Reconciliation, Tax Contingencies, State and Local									0.33%	0.14%	0.06%
Effective Income Tax Rate Reconciliation, Tax Contingencies, Foreign									0.02%	0.01%