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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Fair Values of Financial Assets Measured on Recurring Basis

The fair values of the Company’s financial assets that are measured on a recurring basis are as follows (in thousands):

 

 

 

December 31, 2017

 

 

 

Level 1

 

 

Level 2

 

 

Level 3

 

 

Total

 

Corporate bonds

 

$

 

 

$

53,943

 

 

$

 

 

$

53,943

 

Bond and mutual funds

 

 

18,402

 

 

 

 

 

 

 

 

 

18,402

 

Equity investments

 

 

221

 

 

 

 

 

 

 

 

 

221

 

Money market funds

 

 

569,942

 

 

 

 

 

 

 

 

 

569,942

 

Total

 

$

588,565

 

 

$

53,943

 

 

$

 

 

$

642,508

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

December 31, 2016

 

 

 

Level 1

 

 

Level 2

 

 

Level 3

 

 

Total

 

Corporate bonds

 

$

 

 

$

126,683

 

 

$

 

 

$

126,683

 

Bond and mutual funds

 

 

22,462

 

 

 

 

 

 

 

 

 

22,462

 

Equity investments

 

 

225

 

 

 

 

 

 

 

 

 

225

 

Money market funds

 

 

94,543

 

 

 

 

 

 

 

 

 

94,543

 

Certificate of deposits

 

 

 

 

 

1,037

 

 

 

 

 

 

1,037

 

Total

 

$

117,230

 

 

$

127,720

 

 

$

 

 

$

244,950

 

 

Fair Values of Financial Liabilities Carried at Historical Cost

The fair values of the Company’s financial liabilities that are carried at historical cost are as follows (in thousands):

 

 

 

December 31, 2017

 

 

 

Level 1

 

 

Level 2

 

 

Level 3

 

 

Total

 

Lease financing obligations

 

$

 

 

$

 

 

$

98,476

 

 

$

98,476

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

December 31, 2016

 

 

 

Level 1

 

 

Level 2

 

 

Level 3

 

 

Total

 

Lease financing obligations

 

$

 

 

$

 

 

$

97,856

 

 

$

97,856