Available-for-sale Securities, Amortized Cost Basis, and Cash and Cash Equivalents

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Cash, Cash Equivalents and Investments

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash and cash equivalents:
Cash and cash equivalents	$ 197,945	$ 91,060	$ 85,586	$ 69,649
Cash and Cash Equivalents, Fair Value Disclosure	197,945	91,060
Investments:
Investments, amortized cost	35,785	59,489
Investments, gross unrealized gains	8	1
Investments, gross unrealized losses	(76)	(180)
Investments, fair value	35,717	59,310
Total cash, cash equivalents, and investments, amortized cost	233,730	150,549
Total cash, cash equivalents, and investments, fair value	233,662	150,370
Certificates of deposit (due within 1 year)
Investments:
Investments, amortized cost	6,920	13,611
Investments, gross unrealized gains	4	1
Investments, gross unrealized losses	(1)	(7)
Investments, fair value	6,923	13,605
Certificates of deposit (due within 2 years)
Investments:
Investments, amortized cost		4,760
Investments, gross unrealized gains		0
Investments, gross unrealized losses		(10)
Investments, fair value		4,750
Commercial paper
Investments:
Investments, amortized cost		5,977
Investments, gross unrealized gains		0
Investments, gross unrealized losses		(11)
Investments, fair value		5,966
Corporate bonds (due within 1 year)
Investments:
Investments, amortized cost	27,615	24,002
Investments, gross unrealized gains	4	0
Investments, gross unrealized losses	(75)	(65)
Investments, fair value	27,544	23,937
Corporate bonds (due within 2 years)
Investments:
Investments, amortized cost		9,142
Investments, gross unrealized gains		0
Investments, gross unrealized losses		(84)
Investments, fair value		9,058
Government agencies (due within 1 year)
Investments:
Investments, amortized cost	1,250	1,997
Investments, gross unrealized gains	0	0
Investments, gross unrealized losses	0	(3)
Investments, fair value	1,250	1,994
Cash and money market accounts
Cash and cash equivalents:
Cash and cash equivalents	196,445	91,060
Cash and Cash Equivalents, Fair Value Disclosure	196,445	$ 91,060
Commercial paper
Cash and cash equivalents:
Cash and cash equivalents	1,500
Cash and Cash Equivalents, Fair Value Disclosure	$ 1,500