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Income Taxes (Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate) (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Effective Income Tax Rate Reconciliation, Percent [Abstract]                      
Statutory rate                 35.00% 35.00% 35.00%
State taxes, net of federal tax benefit                 1.60% 1.20% 1.50%
Foreign tax expense and tax rate differential                 (1.20%) (0.70%) 0.50%
Research and development tax credit                 (0.60%) (0.40%) (0.80%)
Domestic Production Activities Deduction                 (0.60%) (0.40%) (0.50%)
PA Tax Law changes and change in valuation allowance on loss carryforwards                 0.00% 0.00% (2.40%)
Net change in uncertain tax positions                 0.00% 0.30% 0.10%
Settlement of state tax petition                 (0.80%) 0.00% 0.00%
Other, net                 0.30% (0.10%) 0.30%
Effective tax rates 29.30% 34.10% 35.60% 35.40% 33.30% 34.70% 35.70% 35.90% 33.70% 34.90% 33.70%