Financial Statements Schedules Schedule III. Supplementary Insurance Information - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
Balance at January 1, net   $ 12,143 $ 12,197 $ 12,392 $ 1,043
Supplemental Information for Property, Casualty Insurance Underwriters, Premiums Written   116,239 123,378    
Net Investment Income   2,918 1,616    
Liability for Claims and Claims Adjustment Expense, Property Casualty Liability   55,471 63,895    
Unearned Premiums   35,234 36,432    
Premiums Earned, Net, Property and Casualty   117,433 117,593    
Amortization   26,361 25,779    
Other Cost and Expense, Operating     20,451    
Property, Liability and Casualty Insurance Product Line [Member]          
Balance at January 1, net   6,696 6,786    
Supplemental Information for Property, Casualty Insurance Underwriters, Premiums Written   116,239 118,021    
Net Investment Income   2,811      
Payments for Losses and Loss Adjustment Expense   87,055 79,070    
Liability for Claims and Claims Adjustment Expense, Property Casualty Liability   55,471 63,895 84,534  
Unearned Premiums     36,432    
Premiums Earned, Net, Property and Casualty   117,433 113,479    
Amortization   23,333 21,713    
Other Cost and Expense, Operating   17,130 19,888    
Corporation [Member]          
Balance at January 1, net   6,696 6,786    
Net Investment Income     1,281    
Payments for Losses and Loss Adjustment Expense   87,055 79,454    
Amortization   23,333 22,594    
Other Segments [Member]          
Supplemental Information for Property, Casualty Insurance Underwriters, Premiums Written   0 5,357    
Net Investment Income $ 0 0 4,114    
Payments for Losses and Loss Adjustment Expense   0 384    
Premiums Earned, Net, Property and Casualty     4,114 $ 4,114  
Amortization   0 881    
Other Cost and Expense, Operating   $ 0 $ 563