Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Income Taxes (Schedule of Reconciliation of Income Tax Rate) (Details)

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Income Taxes (Schedule of Reconciliation of Income Tax Rate) (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Statutory tax rate 24.00% 25.00% 26.50%
Approved and Privileged enterprise benefits 15.70% 7.00% (0.40%)
Goodwill impairment (15.30%)
Revaluation of obligations in connection with acquisitions 0.20%
US Tax Act enactment (222.50%)
Stock compensation expense (5.30%) (2.40%) (0.40%)
Tax contingencies (30.80%) (4.70%) (0.30%)
Non-deductible acquisition expenses (0.60%) (0.20%) (0.10%)
Earning taxed under foreign law 43.30% 34.40% 1.40%
Valuation allowance 144.40% (57.00%) (11.00%)
Changes to the prior year's tax assessment (1.20%) 7.90%
Other 1.50% 0.90% 0.10%
Effective income tax rate (31.50%) 10.90% 0.70%