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Notes Payable (Schedule of Long-term Debt) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Liabilities fair value $ 320,785 $ 301,785
Notes Payable $ 320,000 290,000
Bank Of America [Member]    
Debt Instrument [Line Items]    
Basis spread on variable rate 0.40%  
Union Bank [Member]    
Debt Instrument [Line Items]    
Basis spread on variable rate 0.40%  
Level 2 [Member]    
Debt Instrument [Line Items]    
Liabilities fair value $ 320,765 301,525
Level 2 [Member] | Secured Notes One [Member]    
Debt Instrument [Line Items]    
Secured loan 120,000 120,000
Level 2 [Member] | Secured Notes Two [Member]    
Debt Instrument [Line Items]    
Secured loan 20,000 20,000
Unsecured Debt [Member] | Borrowings [Member]    
Debt Instrument [Line Items]    
Liabilities fair value 180,000 150,000
Unsecured Debt [Member] | Borrowings [Member] | Level 2 [Member]    
Debt Instrument [Line Items]    
Liabilities fair value [1] $ 180,000 $ 150,000
[1] On July 2, 2013, the Company entered into an unsecured $200 million five-year revolving credit facility, which later was expanded to a borrowing capacity of $250 million. The interest rate on borrowings under the credit facility is based on the Company's debt to total capital ratio and ranges from LIBOR plus 112.5 basis points when the ratio is under 15% to LIBOR plus 162.5 basis points when the ratio is above 25%. Commitment fees for the undrawn portions of the credit facility range from 12.5 basis points when the ratio is under 15% to 22.5 basis points when the ratio is above 25%. Debt to capital ratio is expressed as a percentage of (a) consolidated debt to (b) consolidated shareholders' equity plus consolidated debt. In 2016, the interest rate was LIBOR plus 112.5 basis points on the $180 million of borrowings and 12.5 basis points on the undrawn portion of the credit facility. The interest rate was approximately 1.73% at December 31, 2016.