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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
The following table reconciles the difference between the statutory federal income tax rate for the Company and the effective income tax rate on continuing operations for the six months ended June 30, 2018:
Statutory rate
21.0
 %
Income subject to tonnage tax
(1.9
)%
Noncontrolling interests
(2.0
)%
Foreign earnings not subject to U.S. income tax
(23.0
)%
Foreign taxes not creditable against U.S. income tax
3.0
 %
Subpart F income
18.3
 %
Other
0.5
 %
 
15.9
 %