Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2017

Fair Value Measurements [Abstract]

Available-for-sale Securities

The following table shows our cash and available-for-sale securities’ adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category recorded as cash and cash equivalents or short- or long-term investments as of March 31, 2017 (in thousands):

	March 31, 2017
	Adjusted Cost		Unrealized Gains		Unrealized Losses			Fair Value		Cash and Cash Equivalents		Short-Term Investments		Long-Term Investments
Cash	$	1,245,315	$	-	$	-		$	1,245,315	$	1,245,315	$	-	$	-
Level 1:
Money market funds		4,458,266		-		-			4,458,266		4,458,266		-		-
Subtotal		4,458,266		-		-			4,458,266		4,458,266		-		-
Level 2:
Certificates of deposit		2,160,000		1,219		-			2,161,219		-		720,437		1,440,782
Commercial paper		4,781,311		-		(3,931	)		4,777,380		-		4,777,380		-
Corporate notes/bonds		9,700,839		-		(12,807	)		9,688,032		-		8,441,700		1,246,332
U.S. government agencies		3,501,925		-		(6,035	)		3,495,890		-		1,996,640		1,499,250
Subtotal		20,144,075		1,219		(22,773	)		20,122,521		-		15,936,157		4,186,364
Total	$	25,847,656	$	1,219	$	(22,773	)	$	25,826,102	$	5,703,581	$	15,936,157	$	4,186,364