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Fair Value of Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2020
Fair Value Disclosures [Abstract]  
Schedule of fair value of the financial assets and liabilities
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 at September 30, 2020 (unaudited)
Total Fair Value at September 30,
2020		Quoted Prices
in Active Markets
for Identical Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)
Assets:
Cash and cash equivalents
Cash$188,974 $188,974 $— 
Money market funds15,319 15,319 — 
Marketable securities
Corporate debt securities147,657 — 147,657 
Long term marketable securities
Corporate debt securities388,185 258 387,927 
Other noncurrent assets
Marketable securities - restricted (SERP)464 2 462 
Total assets at fair value$740,599 $204,553 $536,046 
Fair Value Measurements at 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 funds102,469 102,469 — 
Marketable securities
Corporate debt securities165,527 — 165,527 
Municipal debt securities165 — 165 
Long term marketable securities
Corporate debt securities571,828 254 571,574 
U.S. government agency and municipal debt securities19,945 — 19,945 
Other noncurrent assets
Marketable securities - restricted (SERP)418 3 415 
Total assets at fair value$939,264 $181,638 $757,626 
Schedule of unrestricted available-for-sale marketable securities Unrestricted available-for-sale marketable securities held by the Company are as follows, (dollars in thousands):
September 30,
2020		December 31, 2019
(unaudited)
Corporate and U.S. government agency and municipal debt securities
Amortized cost$522,920 $747,598 
Gross unrealized gains13,835 10,031 
Gross unrealized losses(913)(164)
Total fair value$535,842 $757,465 
Schedule of contractual maturities of the unrestricted available-for-sale marketable securities held The contractual maturities of the unrestricted available-for-sale marketable securities held by the Company are as follows, (dollars in thousands):
September 30,
2020
(unaudited)
Less than 1 year$147,657 
1 year to 2 years142,272 
2 years to 3 years136,095 
3 years to 4 years109,818 
Greater than 4 years— 
Total$535,842 
Reconciliation of the Beginning and Ending Balances Related to the Contingent Consideration
The following table provides a reconciliation of the beginning and ending balances related to the contingent consideration from the USWM Acquisition (dollars in thousands):
September 30,
2020
(unaudited)
Balance at December 31, 2019$— 
Initial estimate of contingent consideration115,700 
Change in fair value recognized in earnings200 
Balance at September 30, 2020$115,900 
Schedule of financial liabilities that are not carried at fair value The following table sets forth the carrying value and fair value of the Company’s financial liabilities that are not carried at fair value (dollars in thousands):
September 30, 2020December 31, 2019
(unaudited)
Carrying ValueFair Value (Level 2)Carrying ValueFair Value (Level 2)
Convertible notes, net$357,521 $372,816 $345,170 $366,023