• Filing Date: 2020-03-06
  • Form Type: 10-K
  • Description: Annual report
v3.19.3.a.u2
Fair Value Measurements - Available-for-Sale Securities Measured at Fair Value (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Financial Assets:    
Restricted cash $ 700 $ 700
Short-term investments 491 66,479
Total available-for-sale securities 202,839 182,723
Equity securities 35,285 41,143
Fair Value, Measurements, Recurring [Member]    
Financial Assets:    
Cash and cash equivalents 229,218 239,458
Restricted cash 700 700
Short-term investments 491 66,479
Total available-for-sale securities 202,839 182,723
Equity securities 35,285 41,143
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member]    
Financial Assets:    
Cash and cash equivalents 229,218 239,458
Restricted cash 700 700
Short-term investments 491 66,479
Total available-for-sale securities 193,926 170,561
Equity securities 35,285 41,143
Fair Value, Measurements, Recurring [Member] | (Level 2) [Member]    
Financial Assets:    
Total available-for-sale securities 8,913 12,162
Fair Value, Measurements, Recurring [Member] | U.S. Treasury and U.S. Government Agencies [Member]    
Financial Assets:    
Total available-for-sale securities 26,295 61,797
Fair Value, Measurements, Recurring [Member] | U.S. Treasury and U.S. Government Agencies [Member] | (Level 1) [Member]    
Financial Assets:    
Total available-for-sale securities 25,294 60,297
Fair Value, Measurements, Recurring [Member] | U.S. Treasury and U.S. Government Agencies [Member] | (Level 2) [Member]    
Financial Assets:    
Total available-for-sale securities 1,001 1,500
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member]    
Financial Assets:    
Total available-for-sale securities 159,364 101,905
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member] | (Level 1) [Member]    
Financial Assets:    
Total available-for-sale securities 159,364 101,905
Fair Value, Measurements, Recurring [Member] | State, Municipalities, and Political Subdivisions [Member]    
Financial Assets:    
Total available-for-sale securities 7,912 10,662
Fair Value, Measurements, Recurring [Member] | State, Municipalities, and Political Subdivisions [Member] | (Level 2) [Member]    
Financial Assets:    
Total available-for-sale securities 7,912 10,662
Fair Value, Measurements, Recurring [Member] | Exchange-Traded Debt [Member]    
Financial Assets:    
Total available-for-sale securities 9,145 8,247
Fair Value, Measurements, Recurring [Member] | Exchange-Traded Debt [Member] | (Level 1) [Member]    
Financial Assets:    
Total available-for-sale securities 9,145 8,247
Fair Value, Measurements, Recurring [Member] | Redeemable Preferred Stock [Member]    
Financial Assets:    
Total available-for-sale securities 123 112
Fair Value, Measurements, Recurring [Member] | Redeemable Preferred Stock [Member] | (Level 1) [Member]    
Financial Assets:    
Total available-for-sale securities $ 123 $ 112