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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2018
Fair Value Disclosures [Abstract]  
Assets and Liabilities Measured at Fair Value
The following table presents fair value information related to the Company's assets and liabilities measured at amortized cost on the Consolidated Balance Sheets with the exception of the interest rate swap, which is measured at fair value:
Fair Value Measurements at December 31, 2018
 TotalLevel 1Level 2Level 3
Assets
Cash equivalents:
Money market fund deposits and term deposits
$180,965 $180,965 $— $— 
U.S. Treasury and agency obligations
6,495 6,495 — — 
Commercial paper
78,948 — 78,948 — 
Short-term investments:
U.S. Treasury and agency obligations
116,800 116,800 — — 
Corporate bonds
227,009 227,009 — — 
Commercial paper
156,321 — 156,321 — 
Long-term investments and other assets:
Corporate bonds
3,859 3,859 — — 
Auction rate securities
847 — — 847 
Interest rate swap
31 — 31 — 
Total assets
$771,275 $535,128 $235,300 $847 
Liabilities
Long-term notes
$45,378 $— $45,378 $— 
Contingent purchase consideration
898 — — 898 
Total liabilities
$46,276 $— $45,378 $898 

   Fair Value Measurements at December 31, 2017
  
 TotalLevel 1Level 2Level 3
Assets
Cash equivalents:
Money market fund deposits and term deposits
$425,917 $425,917 $— $— 
Short-term investments:
U.S. Treasury and agency obligations
41,217 41,217 — — 
Corporate bonds
131,048 131,048 — — 
Commercial paper
33,896 33,896 — — 
Long-term investments and other assets:
Auction rate securities
1,016 — — 1,016 
Interest rate swap
16 — 16 — 
Total assets
$633,110 $632,078 $16 $1,016 
Liabilities
Long-term notes
$48,982 $— $48,982 $— 
Contingent purchase consideration
902 — — 902 
Total liabilities
$49,884 $— $48,982 $902 
Fair Value, Assets Measured on Recurring Basis
The following table presents information about the Company's movement in Level 3 assets and liabilities measured at fair value:
201820172016
Auction rate securities
Balance, January 1$1,016 $1,144 $1,136 
Period transactions(207)— — 
Change in fair value38 (128)
Balance, December 31$847 $1,016 $1,144 
Contingent purchase consideration
Balance, January 1$902 $— $20 
Period transactions— 902 (21)
Change in fair value48 — 
Foreign exchange adjustment(52)— — 
Balance, December 31$898 $902 $— 
Fair Value, Liabilities Measured on Recurring Basis
The following table presents information about the Company's movement in Level 3 assets and liabilities measured at fair value:
201820172016
Auction rate securities
Balance, January 1$1,016 $1,144 $1,136 
Period transactions(207)— — 
Change in fair value38 (128)
Balance, December 31$847 $1,016 $1,144 
Contingent purchase consideration
Balance, January 1$902 $— $20 
Period transactions— 902 (21)
Change in fair value48 — 
Foreign exchange adjustment(52)— — 
Balance, December 31$898 $902 $— 
Maturities of Debt Securities
The following table presents the effective maturity dates of debt investments as of December 31, 2018 and December 31, 2017:
December 31, 2018December 31, 2017
Book Value Fair Value Book Value Fair Value 
Investment maturity 
Held-to-maturity 
Less than 1 year $585,875 $585,573 $206,257 $206,161 
1 through 5 years 3,859 3,859 — — 
Total $589,734 $589,432 $206,257 $206,161 
Available-for-sale 
Greater than 5 years $847 $847 $1,012 $1,016