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Income Taxes Income Tax Rate (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract] |  |  |
Statutory federal tax rate | 21.00% | 21.00% | 35.00%
State income and foreign taxes, net of federal tax effect |  | (1.00%) | 8.00%
Foreign tax credit |  | 0.00% | 0.00%
Noncontrolling interests in operating subsidiaries |  | 0.00% | 1.00%
Non deductible permanent items |  | (1.00%) | 3.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent |  | 0.00% | (102.00%)
Valuation allowance |  | (20.00%) | (137.00%)
Total |  | (1.00%) | 12.00%

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