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Fair Value Measurement (Methodologies Other Than Fair Value) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Financial assets:    
BOLI $ 60,589 $ 60,134
Other investments 80,576 81,892
Other assets 101,589 96,004
Financial liabilities:    
Debt 448,288 448,202
Total other liabilities 170,317 422,285
Not Measured At Fair Value [Member] | Carrying Value [Member]    
Financial assets:    
BOLI 60,589 60,134
Other investments 50,598 50,391
Other assets 29,196 29,111
Financial liabilities:    
Total other liabilities 17,855 17,033
Not Measured At Fair Value [Member] | Carrying Value [Member] | Senior notes due 2023 [Member]    
Financial liabilities:    
Debt 250,000 250,000
Not Measured At Fair Value [Member] | Carrying Value [Member] | Revolving Credit Facility [Member]    
Financial liabilities:    
Debt 200,000 200,000
Not Measured At Fair Value [Member] | Level 3 [Member] | Fair Value [Member]    
Financial assets:    
BOLI 60,589 60,134
Other investments 62,061 58,757
Other assets 29,072 28,960
Financial liabilities:    
Total other liabilities 17,855 17,011
Not Measured At Fair Value [Member] | Level 3 [Member] | Fair Value [Member] | Senior notes due 2023 [Member]    
Financial liabilities:    
Debt 274,315 270,898
Not Measured At Fair Value [Member] | Level 3 [Member] | Fair Value [Member] | Revolving Credit Facility [Member]    
Financial liabilities:    
Debt $ 200,000 $ 200,000