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STOCKHOLDERS' AND MEMBERS' EQUITY STRUCTURE Treasury Stock (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Class of Stock [Line Items] |  |
Treasury stock, at cost, 6,050,717 shares outstanding at December 31, 2015 and 5,765,946 shares outstanding at December 31, 2014 | $ 160,800 | $ 152,585
Class A Common Stock [Member] |  |
Class of Stock [Line Items] |  |
Treasury stock, at cost, 6,274,261 shares outstanding at December 31, 2018 and 6,132,884 shares outstanding at December 31, 2017 (in shares) | 6,274,261 | 6,132,884
Repurchase Program [Member] | Class A Common Stock [Member] |  |
Class of Stock [Line Items] |  |
Treasury stock, at cost, 6,274,261 shares outstanding at December 31, 2018 and 6,132,884 shares outstanding at December 31, 2017 (in shares) | 6,050,717 |
Treasury stock, at cost, 6,050,717 shares outstanding at December 31, 2015 and 5,765,946 shares outstanding at December 31, 2014 | $ 150,804 |

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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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- Definition The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 + Details
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