Commitments and Contingencies (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	May 17, 2017
Loss Contingencies [Line Items]
Total costs to remediate IRC Section 7702 issue	$ 10,000,000	$ 5,100,000	$ 10,000,000	$ 12,300,000
Toll charges and fees to remediate IRC Section 7702 issue	9,100,000
Cost of claim and reserve liabilities to remediate IRC Section 7702 issue	900,000
Minimum [Member]
Loss Contingencies [Line Items]
Cost Range to Remediate IRC Section 7702 Issue	6,000,000
Maximum [Member]
Loss Contingencies [Line Items]
Cost Range to Remediate IRC Section 7702 Issue	52,500,000
IRC Section 7702 remediation costs [Member] | Minimum [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss	600,000
IRC Section 7702 remediation costs [Member] | Maximum [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 900,000
CICA Life Insurance Company of America [Member]
Loss Contingencies [Line Items]
Toll Charges, Domestic Life Business					$ 124,000
CNLIC subsidiary of CICA [Member]
Loss Contingencies [Line Items]
Toll Charges, Domestic Life Business					$ 4,000