SUBSEQUENT EVENTS	3 Months Ended
Mar. 31, 2018
SUBSEQUENT EVENTS [Abstract]
SUBSEQUENT EVENTS	17. SUBSEQUENT EVENTS New Credit Agreement On April 18, 2018, the Company entered into a Credit Agreement with several financial institutions as lenders and Bank of America, N.A., as administrative agent. The Credit Agreement provides for a $400 million term loan facility and a $350 million revolving credit facility, each with a term of five years. Concurrently with the closing of the Credit Agreement, the Company drew the full amount of the term loan facility and $78.5 million of the revolving facility, each of which initially bear interest at the London Interbank Offered Rate ("LIBOR"), plus 2.25%. The interest rate applicable to the facilities is subject to adjustment based on the Company's consolidated leverage ratio. The term loan facility will amortize in quarterly installments in amounts resulting in an annual amortization of 5.0% during the first and second years, 7.5% during the third and fourth years and 10.0% during the fifth year after the closing date of the Credit Agreement, with the remainder payable at final maturity. The Credit Agreement requires the Company to maintain a consolidated leverage ratio not exceeding 2.25 to 1.00 and a consolidated interest coverage ratio of no less than 3.00 to 1.00. On April 18, 2018, the Company repaid debt that was outstanding under its existing credit agreement, dated as of October 9, 2014, with the several financial institutions party thereto as lenders and Bank of America, N.A., as administrative agent and its 4.75% convertible senior notes due 2020. Repayment of 4.75% Convertible Senior Notes due 2020; Payment of Extension Fee As set forth in Note 11 - Debt, the Company previously issued $210.0 million principal amount of Convertible Notes 4.75% Convertible Senior Notes due 2020 to Ping An ZQ. As previously disclosed, Ping An ZQ elected to convert the Convertible Notes in accordance with the terms of the indenture, dated as of June 16, 2016, by and between the Company and the Bank of New York Mellon Trust Company, N.A., as trustee, that governs the Convertible Notes. As set forth in Note 11 - Debt, in connection with the conversion of the Convertible Notes, the Company satisfied the equity portion of its conversion obligation on February 28, 2018 by issuing 1,535,652 shares of the Company's Class A Common Stock to Ping An ZQ. On April 18, 2018, the Company satisfied the cash portion of its conversion obligation by paying Ping An ZQ $213.4 million (representing payment of (i) the full $210.0 million principal amount of the Convertible Notes, (ii) $3.4 million of accrued interest from December 15, 2017 through April 17, 2018. Upon completion of the Cash Payment, the Company's obligations under the Convertible Notes and the Indenture were satisfied and discharged. On April 18, 2018, the Company paid Ping An ZQ an extension fee in the amount of $105,000 (representing 0.05% of the principal amount of Convertible Notes outstanding as of 5:00 p.m. on April 2, 2018), satisfying in full the Company's obligations to Ping An ZQ under the previously disclosed side letter agreement entered into between the Company and Ping An ZQ.

17. SUBSEQUENT EVENTS

New Credit Agreement

On April 18, 2018, the Company entered into a Credit Agreement with several financial institutions as lenders and Bank of America, N.A., as administrative agent. The Credit Agreement provides for a $400 million term loan facility and a $350 million revolving credit facility, each with a term of five years. Concurrently with the closing of the Credit Agreement, the Company drew the full amount of the term loan facility and $78.5 million of the revolving facility, each of which initially bear interest at the London Interbank Offered Rate ("LIBOR"), plus 2.25%. The interest rate applicable to the facilities is subject to adjustment based on the Company's consolidated leverage ratio. The term loan facility will amortize in quarterly installments in amounts resulting in an annual amortization of 5.0% during the first and second years, 7.5% during the third and fourth years and 10.0% during the fifth year after the closing date of the Credit Agreement, with the remainder payable at final maturity. The Credit Agreement requires the Company to maintain a consolidated leverage ratio not exceeding 2.25 to 1.00 and a consolidated interest coverage ratio of no less than 3.00 to 1.00.

On April 18, 2018, the Company repaid debt that was outstanding under its existing credit agreement, dated as of October 9, 2014, with the several financial institutions party thereto as lenders and Bank of America, N.A., as administrative agent and its 4.75% convertible senior notes due 2020.

Repayment of 4.75% Convertible Senior Notes due 2020; Payment of Extension Fee

As set forth in Note 11 - Debt, the Company previously issued $210.0 million principal amount of Convertible Notes 4.75% Convertible Senior Notes due 2020 to Ping An ZQ. As previously disclosed, Ping An ZQ elected to convert the Convertible Notes in accordance with the terms of the indenture, dated as of June 16, 2016, by and between the Company and the Bank of New York Mellon Trust Company, N.A., as trustee, that governs the Convertible Notes. As set forth in Note 11 - Debt, in connection with the conversion of the Convertible Notes, the Company satisfied the equity portion of its conversion obligation on February 28, 2018 by issuing 1,535,652 shares of the Company's Class A Common Stock to Ping An ZQ. On April 18, 2018, the Company satisfied the cash portion of its conversion obligation by paying Ping An ZQ $213.4 million (representing payment of (i) the full $210.0 million principal amount of the Convertible Notes, (ii) $3.4 million of accrued interest from December 15, 2017 through April 17, 2018. Upon completion of the Cash Payment, the Company's obligations under the Convertible Notes and the Indenture were satisfied and discharged.

On April 18, 2018, the Company paid Ping An ZQ an extension fee in the amount of $105,000 (representing 0.05% of the principal amount of Convertible Notes outstanding as of 5:00 p.m. on April 2, 2018), satisfying in full the Company's obligations to Ping An ZQ under the previously disclosed side letter agreement entered into between the Company and Ping An ZQ.