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Accounting Policies (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
Segment
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Accounting Policies [Abstract]      
Number of reportable segments | Segment 4    
Insurance policy duration 1 year    
Recorded allowances for credit losses (less than) $ 1,500 $ 1,500  
Estimated credit losses 600 600  
Account write offs (up to) 600 600  
Earned But unbilled premiums $ 3,900 3,400  
Minimum period for claims resolution 5 years    
Percentage of tax benefit 50.00%    
Property, Plant and Equipment [Line Items]      
Depreciation $ 7,437 6,956 $ 4,538
Estimated aggregate amortization of intangible assets for 2016 8,100    
Estimated aggregate amortization of intangible assets for 2017 5,600    
Estimated aggregate amortization of intangible assets for 2018 5,600    
Estimated aggregate amortization of intangible assets for 2019 5,600    
Estimated aggregate amortization of intangible assets for 2020 5,600    
Building and Building Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Real estate accumulated depreciation 24,200 23,000  
Depreciation $ 1,500 $ 1,500 $ 1,500