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Investments (Narrative) (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Affiliate
Business
Issuer
investment_interest
Security
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Affiliate
Business
Issuer
investment_interest
Security
Jun. 30, 2016
USD ($)
Issuer
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Issuer
Security
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Schedule of Available-for-sale Securities [Line Items]                
Number of investment affiliates exceeding shareholder's equity ten percent threshold limit | Affiliate 0   0          
Threshold limit of investments based on shareholders' equity 10.00%   10.00%          
Securities on deposit with state insurance departments $ 46,400   $ 46,400          
Business owned life insurance cost 33,000   33,000          
Investment in unconsolidated subsidiaries 330,329   330,329     $ 340,906    
Investments in LPs/LLCs fair value $ 201,154   $ 201,154     204,719    
Number of LPs / LLCs with investment ownership percent over 25% | Business 3   3          
Equity in earnings, losses from affordable housing projects $ (4,000) $ (3,000) $ (7,300) $ (8,300)        
Affordable housing tax credits 4,600 4,600 9,200 9,300        
Losses from historic tax credit investments (2,400) (100) (2,800) (300)        
Tax credits recognized related to historic tax credit investments 800 1,700 2,600 4,200        
Net impairment losses recognized in earnings 0 0 171 9,666        
Portion of noncredit OTTI losses recognized in OCI 0 0 248 1,068        
Credit-related other-than-temporary impairment recognized in earnings 1,313 3,319 1,313 3,319 $ 1,329 1,158 $ 6,559 $ 5,751
Other than Temporary Impairment Losses, Investments $ 0 0 $ 419 10,734        
Tax Credit Partnerships Almost 100% Ownership [Member]                
Schedule of Available-for-sale Securities [Line Items]                
Number of tax credit partnerships almost 100% ownership percentage | investment_interest 2   2          
Investment in unconsolidated subsidiaries $ 36,400   $ 36,400     40,200    
Tax Credit Partnerships Less Than 20% Ownership [Member]                
Schedule of Available-for-sale Securities [Line Items]                
Investment in unconsolidated subsidiaries 58,600   58,600     62,100    
Other Limited Partnerships and Limited Liability Company, Not Considered Investment Funds [Member]                
Schedule of Available-for-sale Securities [Line Items]                
Investment in unconsolidated subsidiaries $ 25,100   $ 25,100     22,400    
Other Limited Partnerships and Limited Liability Company, Greater Than 25% Ownership [Member]                
Schedule of Available-for-sale Securities [Line Items]                
Equity method investment ownership percentage 25.00%   25.00%          
Investment in unconsolidated subsidiaries $ 20,900   $ 20,900     18,500    
Other Limited Partnerships and Limited Liability Company Less than 25% Ownership [Member]                
Schedule of Available-for-sale Securities [Line Items]                
Equity method investment ownership percentage 25.00%   25.00%          
Investment in unconsolidated subsidiaries $ 205,400   $ 205,400     $ 208,600    
Maximum [Member]                
Schedule of Available-for-sale Securities [Line Items]                
Period for federal home loan bank stock liquidation process     5 years          
Maximum [Member] | Tax Credit Partnerships Almost 100% Ownership [Member]                
Schedule of Available-for-sale Securities [Line Items]                
Equity method investment ownership percentage 100.00%   100.00%          
Maximum [Member] | Tax Credit Partnerships Less Than 20% Ownership [Member]                
Schedule of Available-for-sale Securities [Line Items]                
Equity method investment ownership percentage 20.00%   20.00%          
Fixed maturities [Member]                
Schedule of Available-for-sale Securities [Line Items]                
Required FAL Deposit $ 94,800   $ 94,800          
Short-term investments [Member]                
Schedule of Available-for-sale Securities [Line Items]                
Required FAL Deposit $ 3,400   $ 3,400          
Non Government-Backed [Member]                
Schedule of Available-for-sale Securities [Line Items]                
Number of debt securities in unrealized loss position | Security 534   534     703    
Debt securities in unrealized loss position as percentage of total debt securities held 21.40%   21.40%     27.20%    
Number of issuers in unrealized loss position | Issuer 363   363     456    
Single greatest unrealized loss position $ 500   $ 500     $ 500    
Second greatest unrealized loss position 300   300     $ 500    
Corporate debt [Member]                
Schedule of Available-for-sale Securities [Line Items]                
Portion of noncredit OTTI losses recognized in OCI 0 0 248 1,068        
Credit-related other-than-temporary impairment recognized in earnings   5,500   $ 5,500        
Debt securities, number of issuers | Issuer       10        
Other than Temporary Impairment Losses, Investments 0 0 419 $ 7,604        
Corporate bonds [Member]                
Schedule of Available-for-sale Securities [Line Items]                
Net impairment losses recognized in earnings       6,500        
Portion of noncredit OTTI losses recognized in OCI       900        
Other investments [Member]                
Schedule of Available-for-sale Securities [Line Items]                
Net impairment losses recognized in earnings       3,100        
Other than Temporary Impairment Losses, Investments 0 $ 0 0 $ 3,130        
Revolving Credit Facility [Member]                
Schedule of Available-for-sale Securities [Line Items]                
Securities pledged as collateral $ 239,800   $ 239,800