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FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS (Details 2) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Apr. 03, 2018
Assets, Fair Value Disclosure      
Cash and cash equivalents $ 51,509 $ 58,294  
Restricted cash 3,915 5,752  
Investment in equity securities 38,419 36,181  
Level 1 | Fair Value, Measurements, Recurring      
Assets, Fair Value Disclosure      
Cash and cash equivalents 51,509 58,294  
Restricted cash 3,915 5,752  
Investment in equity securities 38,419 36,181  
Long-term receivable 0 0  
Level 2 | Fair Value, Measurements, Recurring      
Assets, Fair Value Disclosure      
Cash and cash equivalents 0 0  
Restricted cash 0 0  
Investment in equity securities 0 0  
Long-term receivable 0 0  
Level 3 | Fair Value, Measurements, Recurring      
Assets, Fair Value Disclosure      
Cash and cash equivalents 0 0  
Restricted cash 0 0  
Investment in equity securities 0 0  
Long-term receivable 2,258 2,221  
Prior senior secured term loan      
Liabilities, Fair Value Disclosure      
Long-term debt, carrying amount 338,822 338,822 $ 412,100
Prior senior secured term loan | Level 1 | Fair Value, Measurements, Recurring      
Liabilities, Fair Value Disclosure      
Long-term debt, fair value 0 0  
Prior senior secured term loan | Level 2 | Fair Value, Measurements, Recurring      
Liabilities, Fair Value Disclosure      
Long-term debt, fair value 328,657 330,351  
Prior senior secured term loan | Level 3 | Fair Value, Measurements, Recurring      
Liabilities, Fair Value Disclosure      
Long-term debt, fair value $ 0 $ 0