Annual report pursuant to Section 13 and 15(d)

Income Taxes Income Taxes (Effective Income Tax Rate Reconciliation) (Details)

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Income Taxes Income Taxes (Effective Income Tax Rate Reconciliation) (Details)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation, Percent [Abstract]      
Provision at statutory rate 35.00% 35.00% 35.00%
State income taxes, net of federal benefit 1.40% 0.90% 0.70%
Foreign taxes 0.20% 0.60% 0.60%
Foreign earnings repatriation 0.20% (0.30%) (0.40%)
Valuation allowance 0.90% 0.20% 0.00%
Permanent differences (0.20%) (0.50%) 0.00%
Other, net (0.50%) 0.00% (0.10%)
Total income tax expense 37.00% 35.90% 35.80%