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Statutory Information (Details)
12 Months Ended
Dec. 31, 2016
USD ($)
jurisdiction
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Statutory Capital [Abstract]      
Percentage of premiums earned required to be maintained as contingency loss reserves (in hundredths) 50.00%    
Period that contingency loss reserves must be held (in years) 10 years    
Percentage of net premiums earned that incurred losses must exceed to enable early withdrawals from contingency loss reserves (in hundredths) 35.00%    
Related Party Transaction [Line Items]      
Statutory net income (loss) $ 106,326,000 $ (72,767,000) $ 13,203,000
Statutory policyholders' surplus 1,506,475,000 1,608,214,000 1,585,164,000
Contingency reserve 1,360,088,000 826,706,000 318,247,000
Dividends paid to the parent company $ 64,000,000    
Statutory capital requirements [Abstract]      
Number of jurisdictions with risk-to-capital requirements | jurisdiction 16    
Maximum permitted risk-to-capital ratio commonly applied 25 to 1    
Risk-to-capital ratio on a combined basis at end of period 12.0 to 1    
Risk-to-capital ratio on combined insurance operations 12.0    
Percentage of statutory policyholders surplus used to determine maximum allowable dividends 10.00%    
Maximum      
Statutory capital requirements [Abstract]      
Risk to capital ratio 25    
Mortgage Guaranty Insurance Corporation      
Related Party Transaction [Line Items]      
Loss ratio 26.00%    
Additions to the surplus of MGIC from parent company funds $ 36,025,000 0 0
Dividends paid to the parent company $ 64,000,000 0 0
Statutory capital requirements [Abstract]      
Risk to capital ratio 10.7    
Risk to capital ratio at end of period 10.7 to 1    
Amount of policyholders position above or below required MPP $ 1,600,000,000    
Amount of required MPP $ 1,100,000,000    
Adjusted statutory net income measurement period 3 years    
Adjusted statutory net income dividend payment measurement period 2 years    
Adjustment to statutory net income $ 490,000,000    
Other Insurance Subsidiaries      
Related Party Transaction [Line Items]      
Dividends paid to the parent company   6,500,000 0
Distributions from other insurance subsidiaries to the parent company $ 52,001,000 $ 38,500,000 $ 0