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Fair Value of Financial Instruments
12 Months Ended
Dec. 31, 2019
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments Fair Value of Financial Instruments
The fair value of an asset or liability represents the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants.
The Company reports assets and liabilities measured at fair value using a three level hierarchy that prioritizes the inputs used to measure fair value. The three levels of inputs used to measure fair value are as follows:
Level 1—Inputs are unadjusted quoted prices in active markets for identical assets. The Company has the ability to access these prices as of the measurement date.
Level 2—Level 2 securities are valued using third-party pricing sources that apply applicable inputs and other relevant data in their models to estimate fair value. Inputs are quoted prices for similar assets and liabilities in active markets; quoted prices for identical or similar assets and liabilities in markets that are not active; inputs other than quoted prices, that are observable for the asset or liability (e.g., interest rates; yield curves); and inputs that are derived principally from or corroborated by observable market data by correlation or by other means (i.e., market corroborated inputs).
Level 3—Unobservable inputs that reflect the Company’s own assumptions. These are based on the best information available, including the Company’s own data.
Financial Assets
The Company’s financial assets that are required to be measured at fair value on a recurring basis are as follows (dollars in thousands):
 
 
 
Fair Value Measurements as of December 31,
2019
 
Total Fair
value at
December 31, 2019
 
Quoted Prices
in Active Markets
for Identical Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
Assets:
 
 
 
 
 
Cash and cash equivalents
 
 
 
 
 
 Cash
$
78,912

 
$
78,912

 
$

 Money market funds
102,469

 
102,469

 

Marketable securities
 
 
 
 
 
Corporate debt securities
165,527

 

 
165,527

Municipal debt securities
165

 

 
165

Long term marketable securities
 
 
 
 
 
Corporate debt securities
571,828

 
254

 
571,574

U.S. government agency debt securities
19,945

 

 
19,945

Other noncurrent assets
 
 
 
 
 
Marketable securities - restricted (SERP)
418

 
3

 
415

Total assets at fair value
$
939,264

 
$
181,638

 
$
757,626

 
 
 
Fair Value Measurements as of December 31,
2018
 
Total Fair Value at
December 31, 2018
 
Quoted Prices
in Active Markets
for Identical Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
Assets:
 

 
 

 
 

Cash and cash equivalents
 
 
 
 
 
Cash
$
106,918

 
$
106,918

 
$

Money market funds
85,330

 
85,330

 

Marketable securities
 
 
 
 
 
Corporate debt securities
163,770

 
245

 
163,525

Long term marketable securities
 
 
 
 
 
Corporate debt securities
415,650

 
445

 
415,205

U.S. government agency debt securities
2,983

 

 
2,983

Municipal debt securities
165

 

 
165

Other noncurrent assets
 
 
 
 
 
Marketable securities - restricted (SERP)
326

 
1

 
325

Total assets at fair value
$
775,142

 
$
192,939

 
$
582,203


Level 1 assets include: cash held at banks; certificates of deposit; money market funds; and investment grade corporate debt securities.
Level 2 assets include: commercial paper; investment grade corporate, U.S. government agency, state and municipal debt securities; other fixed income securities and SERP (Supplemental Executive Retirement Plan) assets. The fair value of the restricted marketable securities is recorded in Other assets on the consolidated balance sheets.
There were no level 3 assets as of December 31, 2019 or 2018.
The carrying amounts of other financial instruments, including accounts receivable, accounts payable and accrued expenses approximate fair value due to their short-term maturities.

Unrestricted available-for-sale marketable securities held by the Company are as follows (dollars in thousands):
 
December 31,
2019
 
December 31, 2018
 
 
 
 
Corporate and U.S. government agency and municipal debt securities
 
 
 
Amortized cost
$
747,598

 
$
586,726

Gross unrealized gains
10,031

 
55

Gross unrealized losses
(164
)
 
(4,213
)
Total fair value
$
757,465

 
$
582,568


The contractual maturities of the unrestricted available-for-sale marketable securities held by the Company are as follows (dollars in thousands):
 
December 31,
2019
Less Than 1 Year
$
165,692

1 year to 2 years
188,378

2 year to 3 years
201,491

3 years to 4 years
201,904

Greater Than 4 Years

Total
$
757,465


The Company has not experienced any other-than-temporary losses on its marketable securities.
Financial Liabilities
The following table sets forth the Company’s financial liabilities that are not carried at fair value (dollars in thousands):
 
December 31, 2019
 
December 31, 2018
 
 
 
 
 
 
 
Carrying Value
 
Fair Value (Level 2)
 
Carrying Value
 
Fair Value (Level 2)
2023 Notes
$
345,170

 
$
366,023

 
$
329,462

 
$
375,834


The fair value is estimated based on actual trade information, as well as quoted prices provided by bond traders.