• Filing Date: 2020-03-06
  • Form Type: 10-K
  • Description: Annual report
v3.19.3.a.u2
Fair Value Measurements - Schedule of Fair Value Information for Financial Assets and Liabilities Carried on Balance Sheet (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Financial Assets:    
Limited partnership investments $ 28,346 $ 32,293
Financial Liabilities:    
Revolving credit facility 9,750  
Total long-term debt 163,695 250,150
Carrying Value [Member]    
Financial Assets:    
Limited partnership investments 28,346 32,293
Financial Liabilities:    
Revolving credit facility 9,750  
Total long-term debt 163,635 250,095
Estimate of Fair Value Measurement [Member]    
Financial Assets:    
Limited partnership investments 28,346 32,293
Financial Liabilities:    
Revolving credit facility 9,750  
Total long-term debt 177,334 266,383
Estimate of Fair Value Measurement [Member] | (Level 2) [Member]    
Financial Liabilities:    
Revolving credit facility 9,750  
Total long-term debt 147,375 235,441
Estimate of Fair Value Measurement [Member] | (Level 3) [Member]    
Financial Assets:    
Limited partnership investments 28,346 32,293
Financial Liabilities:    
Total long-term debt 29,959 30,942
3.875% Convertible Senior Notes [Member] | Carrying Value [Member]    
Financial Liabilities:    
Total long-term debt   89,181
3.875% Convertible Senior Notes [Member] | Estimate of Fair Value Measurement [Member]    
Financial Liabilities:    
Total long-term debt   89,824
3.875% Convertible Senior Notes [Member] | Estimate of Fair Value Measurement [Member] | (Level 2) [Member]    
Financial Liabilities:    
Total long-term debt   89,824
4.25% Convertible Senior Notes [Member] | Carrying Value [Member]    
Financial Liabilities:    
Total long-term debt 134,075 130,120
4.25% Convertible Senior Notes [Member] | Estimate of Fair Value Measurement [Member]    
Financial Liabilities:    
Total long-term debt 147,375 145,617
4.25% Convertible Senior Notes [Member] | Estimate of Fair Value Measurement [Member] | (Level 2) [Member]    
Financial Liabilities:    
Total long-term debt 147,375 145,617
3.95% Promissory Note [Member] | Carrying Value [Member]    
Financial Liabilities:    
Total long-term debt 8,875 9,077
3.95% Promissory Note [Member] | Estimate of Fair Value Measurement [Member]    
Financial Liabilities:    
Total long-term debt 8,887 9,128
3.95% Promissory Note [Member] | Estimate of Fair Value Measurement [Member] | (Level 3) [Member]    
Financial Liabilities:    
Total long-term debt 8,887 9,128
4% Promissory Note [Member] | Carrying Value [Member]    
Financial Liabilities:    
Total long-term debt 7,237 7,732
4% Promissory Note [Member] | Estimate of Fair Value Measurement [Member]    
Financial Liabilities:    
Total long-term debt 7,409 7,788
4% Promissory Note [Member] | Estimate of Fair Value Measurement [Member] | (Level 3) [Member]    
Financial Liabilities:    
Total long-term debt 7,409 7,788
3.75% Promissory Note [Member] | Carrying Value [Member]    
Financial Liabilities:    
Total long-term debt 7,837 8,159
3.75% Promissory Note [Member] | Estimate of Fair Value Measurement [Member]    
Financial Liabilities:    
Total long-term debt 7,861 8,001
3.75% Promissory Note [Member] | Estimate of Fair Value Measurement [Member] | (Level 3) [Member]    
Financial Liabilities:    
Total long-term debt 7,861 8,001
4.55% Promissory Note [Member] | Carrying Value [Member]    
Financial Liabilities:    
Total long-term debt 5,611 5,826
4.55% Promissory Note [Member] | Estimate of Fair Value Measurement [Member]    
Financial Liabilities:    
Total long-term debt 5,802 6,025
4.55% Promissory Note [Member] | Estimate of Fair Value Measurement [Member] | (Level 3) [Member]    
Financial Liabilities:    
Total long-term debt $ 5,802 $ 6,025