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Note 12 - Redeemable Non-controlling Interests - Reconciliation of the Beginning and Ending NCI Amounts (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Balance | $ 134,803 | $ 139,592
Non-controlling interest share of earnings | 20,236 | 20,085
Non-controlling interest redemption increment (note 12) | 22,583 | 3,521
Distributions paid to RNCI | (20,797) | (16,495)
Balance | 145,489 | 134,803
Non-controlling Interest Share of Earnings [Member] |  |
Non-controlling interest share of earnings | 16,497 | 15,943
Non-controlling Interest Redemption Increment [Member] |  |
Non-controlling interest redemption increment (note 12) | 22,583 | 3,521
Non-controlling Interest Distributions Paid to NCI [Member] |  |
Distributions paid to RNCI | (12,870) | (14,428)
Non-controlling Interest Purchase of Interests from NCI Net [Member] |  |
Purchases of interests from RNCI, net | (31,782) | (9,825)
Non-controlling Interest Recognized on Business Acquisitions [Member] |  |
RNCI recognized on business acquisitions | $ 16,258 |

X
- Definition This element represents the fair value of the noncontrolling interest recognized in the acquiree during the fiscal period. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of Net Income (Loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591551-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 + Details
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- Definition Portion of equity (net assets) in a subsidiary not attributable, directly or indirectly, to the parent entity which is not redeemable by the parent entity. + References No definition available. + Details
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- Definition The cash outflow during the period for redemption of redeemable noncontrolling interests. + References No definition available. + Details
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- Definition Amount of cash outflow in the form of ordinary dividends provided by the non-wholly owned subsidiary to noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition Amount of decrease to net income for accretion of temporary equity to its redemption value to derive net income apportioned to common stockholders. + References No definition available. + Details
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