Accounts Receivable (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Accounts Receivable
Premiums receivable	$ 16,784,000		$ 16,034,000
Other receivables	416,000		603,000
Total accounts receivable	17,200,000		16,637,000
Accounts receivable, net	17,200,000		$ 16,637,000
Provision for doubtful accounts	$ 0	$ 0
Premiums receivable
Accounts Receivable
Threshold period unpaid for write-off of mortgage insurance premiums	90 days