Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands		Jun. 30, 2017	Dec. 31, 2016
Allowance for Doubtful Accounts		$ 17,320	$ 12,504
Preferred stock par value (usd per share)		$ 0.001	$ 0.001
Preferred stock authorized (shares)		40,000,000	40,000,000
Preferred stock issued (shares)		0	0
Preferred stock outstanding (shares)		0	0
Treasury stock (shares)		14,102,185	14,102,453
Total Assets	[1]	$ 8,045,275	$ 9,401,051
Liabilities	[1]	$ 5,122,195	$ 5,855,368
Class A Common Stock
Common stock, par value (usd per share)		$ 0.001	$ 0.001
Common stock, authorized (shares)		1,000,000,000	1,000,000,000
Common stock, issued shares (shares)		101,284,525	100,416,516
Common stock, outstanding (shares)		87,182,340	86,314,063
Class B Common Stock
Common stock, par value (usd per share)		$ 0.001	$ 0.001
Common stock, authorized (shares)		1,000,000,000	1,000,000,000
Common stock, issued shares (shares)		5,605	5,605
Common stock, outstanding (shares)		5,605	5,605
Senior Secured Credit Agreement | Term Loan Facility
Unamortized discounts and debt issuance costs		$ 27,000	$ 31,000
Current | Senior Secured Credit Agreement | Term Loan Facility
Unamortized discounts and debt issuance costs		3,786	7,917
Noncurrent | Senior Secured Credit Agreement | Term Loan Facility
Unamortized discounts and debt issuance costs		37,421	38,830
Variable Interest Entity, Primary Beneficiary
Total Assets		92,000	97,000
Liabilities		$ 2,000	$ 3,000

[1] (1) The Company’s consolidated total assets as of June 30, 2017 and December 31, 2016 include total assets of variable interest entities (“VIEs”) of $92 million and $97 million, respectively, which can only be used to settle the obligations of the VIEs. The Company’s consolidated total liabilities as of June 30, 2017 and December 31, 2016 include total liabilities of the VIEs of $2 million and $3 million, respectively, for which the creditors of the VIEs have no recourse to the Company (see Note 1).