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Note 9 - Redeemable Non-controlling Interests - Reconciliation of the Beginning and Ending NCI Amounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Balance, January 1 $ 77,559 $ 80,926
Non-controlling interest share of earnings 5,238 4,560
Non-controlling interest redemption increment (note 9) 15,408 12,243
Distributions paid to non-controlling interests (4,985) (3,602)
RNCI recognized on business acquisitions 10,612 1,696
Less: Comprehensive earnings attributable to non-controlling shareholders 20,646 16,803
Balance, December 31 102,352 77,559
Non-controlling Interest Share Of Earnings [Member]    
Non-controlling interest share of earnings 5,238 4,560
Non-controlling Interest Redemption Increment [Member]    
Non-controlling interest redemption increment (note 9) 15,408 12,243
Non-controlling Interest Distributions Paid To NCI [Member]    
Distributions paid to non-controlling interests (4,985) (3,602)
Non-controlling Interest Purchase Of Interests From NCI Net [Member]    
Purchases of interests from RNCI, net (1,057) (17,817)
Non-controlling Interest Share Of Other Comprehensive Earnings [Member]    
Less: Comprehensive earnings attributable to non-controlling shareholders $ (423) $ (447)