NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Supplemental Information - Statement of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Supplemental Information - Statements of Cash Flows
Income taxes paid	$ 108,347	$ 106,979	$ 100,986
Income tax refunds	12,193	196	1,407
Interest paid	191,117	182,425	157,349
Non- cash transactions
Non-cash transaction property and equipment	$ 5,900
Non-cash transactions related to capital lease obligations		$ 2,800	$ 0
4.875% Notes
Non- cash transactions
Interest rate (as a percent)		4.875%
4.875% Notes | Class A Common Stock
Non- cash transactions
Non-cash conversion, net of tax		$ 8,600