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Fair Value Measurement (Methodologies Other Than Fair Value) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Financial assets:    
BOLI $ 61,031 $ 60,134
Other investments 80,466 81,892
Other assets 101,530 96,004
Financial liabilities:    
Debt 426,374 448,202
Total other liabilities 169,810 422,285
Not Measured At Fair Value [Member] | Carrying Value [Member]    
Financial assets:    
BOLI 61,031 60,134
Other investments 49,652 50,391
Other assets 33,386 29,111
Financial liabilities:    
Total other liabilities 18,868 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 178,000 200,000
Not Measured At Fair Value [Member] | Level 3 [Member] | Fair Value [Member]    
Financial assets:    
BOLI 61,031 60,134
Other investments 58,704 58,757
Other assets 33,225 28,960
Financial liabilities:    
Total other liabilities 18,868 17,011
Not Measured At Fair Value [Member] | Level 3 [Member] | Fair Value [Member] | Senior notes due 2023 [Member]    
Financial liabilities:    
Debt 274,610 270,898
Not Measured At Fair Value [Member] | Level 3 [Member] | Fair Value [Member] | Revolving Credit Facility [Member]    
Financial liabilities:    
Debt $ 178,000 $ 200,000