Note 8. Restricted Cash and Investments (Tables)

12 Months Ended

Dec. 31, 2017

Restricted Cash and Investments [Abstract]

Restricted cash and investments consisted of the following at December 31, 2017 and 2016 (in thousands):



	2017		2016
Restricted cash	$	50,822	$	31,381
Restricted investments	373,961		339,926
Total restricted cash and investments (1)	$	424,783	$	371,307

——————————


(1)	There was an additional $11.1 million and $37.2 million of restricted cash included within “Prepaid expenses and other current assets” at December 31, 2017 and 2016, respectively.

Restricted Available For Sale Securities

The following tables summarize the unrealized gains and losses related to our restricted investments, by major security type, as of December 31, 2017 and 2016 (in thousands):



	As of December 31, 2017
	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
Foreign government obligations	$	127,436	$	62,483	$	—	$	189,919
U.S. government obligations	174,624		12,944		3,526		184,042
Total	$	302,060	$	75,427	$	3,526	$	373,961



	As of December 31, 2016
	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
Foreign government obligations	$	107,604	$	62,350	$	—	$	169,954
U.S. government obligations	169,294		10,468		9,790		169,972
Total	$	276,898	$	72,818	$	9,790	$	339,926