• Filing Date: 2017-02-22
  • Form Type: 10-K
  • Description: Annual report
v3.6.0.2
Fair Value Measurements - Schedule of Fair Value Information for Financial Assets and Liabilities Carried on Balance Sheet (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Financial Assets:    
Limited partnership investments $ 29,263 $ 23,930
ADC Arrangement classified as real estate investment   10,200
Financial Liabilities:    
Total long-term debt 138,863 129,429
Estimate of Fair Value Measurement [Member]    
Financial Assets:    
Limited partnership investments 29,263 23,930
ADC Arrangement classified as real estate investment   10,140
Financial Liabilities:    
Revolving credit facility 9,463  
Total long-term debt 143,484 133,885
Estimate of Fair Value Measurement [Member] | Senior Notes [Member]    
Financial Liabilities:    
Total long-term debt 41,618 41,103
Estimate of Fair Value Measurement [Member] | Convertible Senior Notes [Member]    
Financial Liabilities:    
Total long-term debt 84,696 92,782
Estimate of Fair Value Measurement [Member] | 4% Promissory Note [Member]    
Financial Liabilities:    
Total long-term debt 8,664  
Estimate of Fair Value Measurement [Member] | 3.75% Promissory Note [Member]    
Financial Liabilities:    
Total long-term debt 8,506  
Estimate of Fair Value Measurement [Member] | (Level 2) [Member]    
Financial Liabilities:    
Total long-term debt 41,618 41,103
Estimate of Fair Value Measurement [Member] | (Level 2) [Member] | Senior Notes [Member]    
Financial Liabilities:    
Total long-term debt 41,618 41,103
Estimate of Fair Value Measurement [Member] | (Level 3) [Member]    
Financial Assets:    
Limited partnership investments 29,263 23,930
ADC Arrangement classified as real estate investment   10,140
Financial Liabilities:    
Revolving credit facility 9,463  
Total long-term debt 101,866 92,782
Estimate of Fair Value Measurement [Member] | (Level 3) [Member] | Convertible Senior Notes [Member]    
Financial Liabilities:    
Total long-term debt 84,696 92,782
Estimate of Fair Value Measurement [Member] | (Level 3) [Member] | 4% Promissory Note [Member]    
Financial Liabilities:    
Total long-term debt 8,664  
Estimate of Fair Value Measurement [Member] | (Level 3) [Member] | 3.75% Promissory Note [Member]    
Financial Liabilities:    
Total long-term debt 8,506  
Carrying Value [Member]    
Financial Assets:    
Limited partnership investments 29,263 23,930
ADC Arrangement classified as real estate investment   10,200
Financial Liabilities:    
Revolving credit facility 9,463  
Total long-term debt 138,863 129,429
Carrying Value [Member] | Senior Notes [Member]    
Financial Liabilities:    
Total long-term debt 39,448 39,231
Carrying Value [Member] | Convertible Senior Notes [Member]    
Financial Liabilities:    
Total long-term debt 81,988 $ 90,198
Carrying Value [Member] | 4% Promissory Note [Member]    
Financial Liabilities:    
Total long-term debt 8,660  
Carrying Value [Member] | 3.75% Promissory Note [Member]    
Financial Liabilities:    
Total long-term debt $ 8,767