Cash, Cash Equivalents, Short-Term Investments, Restricted Cash Equivalents and Investments (Tables)

9 Months Ended

Sep. 30, 2013

Cash and Cash Equivalents [Abstract]

Cash Cash Equivalents Short-Term Investments and Restricted Cash Equivalents and Investments

Cash and cash equivalents, short-term investments, and restricted cash equivalents and investments as of September 30, 2013, consisted of the following (in thousands):

	Amortized Cost		Estimated Fair Value
Cash and cash equivalents:
Cash	$	39,348	$	39,348
Money market mutual funds	23,038		23,038
Corporate notes and bonds	72,494		72,493
Total cash and cash equivalents	134,880		134,879
Short-term investments:
Corporate notes and bonds	60,005		60,041
U.S. government agency securities	23,478		23,486
Total short-term investments	83,483		83,527
Total cash, cash equivalents and short-term investments	$	218,363	$	218,406
Restricted cash equivalents and investments	$	5,000	$	5,000

Cash and cash equivalents, short-term investments, and restricted cash equivalents and investments as of December 31, 2012 consisted of the following (in thousands):

	Amortized Cost		Estimated Fair Value
Cash and cash equivalents:
Cash	$	71,283	$	71,283
Money market mutual funds	10,680		10,680
Corporate notes and bonds	81,237		81,235
Total cash and cash equivalents	163,200		163,198

Short-term investments:
Corporate notes and bonds	65,426		65,502
U.S. Government agency securities	42,693		42,714
Total short-term investments	108,119		108,216
Total cash, cash equivalents, and short-term investments	$	271,319	$	271,414
Restricted cash equivalents and investments	$	10,000	$	10,000

Contractual Maturities of Short-Term Investments

ontractual maturities of short-term investments as of September 30, 2013 (in thousands):

	Estimated Fair Value
Within one year	$	57,321
Between one year and five years	26,206
Total short-term investments	$	83,527