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Note 22 - Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
    Carrying value at     Fair value measurements  
    December 31, 2019     Level 1     Level 2     Level 3  
                         
Assets                                
Deferred Purchase Price on AR Facility   $
69,873
    $
-
    $
-
    $
69,873
 
Investments in equity securities   $
3,887
    $
3,887
    $
-
    $
-
 
                                 
                                 
Liabilities                                
Contingent consideration liability   $
84,992
    $
-
    $
-
    $
84,992
 
Interest rate swap liability    
4,615
     
-
     
4,615
     
-
 
Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table Text Block]
    2019     2018  
Balance, January 1   $
93,865
    $
50,300
 
Amounts recognized on acquisitions    
-
     
61,525
 
Fair value adjustments (note 5)    
10,849
     
1,675
 
Resolved and settled in cash    
(19,665
)    
(18,757
)
Other    
(58
)    
(877
)
Balance, December 31   $
84,993
    $
93,865
 
                 
Less: current portion   $
16,813
    $
17,122
 
Non-current portion   $
68,180
    $
76,743
 
Fair Value, by Balance Sheet Grouping [Table Text Block]
    2019     2018  
    Carrying     Fair     Carrying     Fair  
    amount     value     amount     value  
                         
Other receivables   $
16,678
    $
16,678
    $
12,088
    $
12,088
 
Advisor loans receivable (non-current)    
48,283
     
48,283
     
46,661
     
46,661
 
Long-term debt (non-current)    
372,281
     
372,281
     
430,712
     
430,712
 
Senior Notes    
234,901
     
254,858
     
239,577
     
268,838