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Guarantees (Tables)
12 Months Ended
Dec. 31, 2018
Guarantees [Abstract]  
Letters of credit and surety bonds outstanding
At December 31, 2018 and 2017, we had letters of credit and surety bonds outstanding, which primarily guarantee various insurance activities as noted in the following table:
 
 
 
December 31,
 
 
2018
 
2017
 
 
(In thousands)
Letters of credit
 
$
253,259

 
238,610

Surety bonds
 
121,757

 
111,007