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FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS (Details 2) - USD ($)
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Assets, Fair Value Disclosure        
Cash and cash equivalents $ 117,098,000 $ 149,294,000 $ 159,705,000 $ 179,327,000
Restricted cash 4,127,000 4,127,000    
Available for sale securities 63,202,000 45,754,000 $ 0  
Liabilities, Fair Value Disclosure        
Acquisition contingent consideration 384,000 376,000    
Long-term debt, carrying amount 478,167,000 479,653,000    
Level 1 | Fair Value, Measurements, Recurring        
Assets, Fair Value Disclosure        
Cash and cash equivalents 117,098,000 149,294,000    
Restricted cash 4,127,000 4,127,000    
Available for sale securities 63,202,000 45,754,000    
Liabilities, Fair Value Disclosure        
Acquisition contingent consideration 0 0    
Long-term debt, fair value 0 0    
Level 2 | Fair Value, Measurements, Recurring        
Assets, Fair Value Disclosure        
Cash and cash equivalents 0 0    
Restricted cash 0 0    
Available for sale securities 0 0    
Liabilities, Fair Value Disclosure        
Acquisition contingent consideration 0 0    
Long-term debt, fair value 461,431,000 474,856,000    
Level 3 | Fair Value, Measurements, Recurring        
Assets, Fair Value Disclosure        
Cash and cash equivalents 0 0    
Restricted cash 0 0    
Available for sale securities 0 0    
Liabilities, Fair Value Disclosure        
Acquisition contingent consideration 384,000 376,000    
Long-term debt, fair value $ 0 $ 0