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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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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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