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Allowance for Uncollectible Premiums Receivable (Tables)
 3 Months Ended
Mar. 31, 2020
Premiums Receivable [Abstract]  
Premium Receivable, Allowance for Credit Loss [Table Text Block]
($ in thousands)
March 31, 2020
Balance, December 31, 2019
$
6,400

Cumulative effect adjustment1
1,058

Balance, January 1, 2020
$
7,458

Current period provision for expected credit losses
11,195

Write-offs charged against the allowance
(653
)
Recoveries
—

Allowance for credit losses, end of period
$
18,000