Guarantees (Tables)

12 Months Ended

Dec. 31, 2017

Guarantees [Abstract]

Letters of credit and surety bonds outstanding

At December 31, 2017 and 2016, we had letters of credit and surety bonds outstanding, which primarily guarantee various insurance activities as noted in the following table:

	December 31,
	2017		2016
	(In thousands)
Letters of credit	$	238,610	240,420
Surety bonds	111,007		113,696