Income Taxes (Details Textual) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Valuation Allowance	$ 59.9		$ 59.5
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%		35.00%
Tax Credit Carryforward, Limitations on Use	Pursuant to the Tax Reform, alternative minimum tax (“AMT”) credit carryforwards will be eligible for a 50% refund through tax years 2018 through 2020.
Tax Credit Carryforward, Valuation Allowance	$ 3.1
Deferred Income Tax Assets, Net	3.1
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount			$ 33.7
Scenario, Plan [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%
State and Local Jurisdiction [Member]
Operating Loss Carryforwards	$ 103.9
Operating Loss Carryforward Expiration Year	2034
State and Local Jurisdiction [Member] | Minimum [Member]
Operating Loss Carryforward Expiration Year	2029
Federal [Member]
Operating Loss Carryforwards	$ 232.6
Federal [Member] | Maximum [Member]
Operating Loss Carryforward Expiration Year	2034
New York State [Member]
Discontinued Operation, Tax Effect of Adjustment to Prior Period Gain (Loss) on Disposal	$ 31.1
New York City [Member]
Discontinued Operation, Tax Effect of Adjustment to Prior Period Gain (Loss) on Disposal	$ 25.5