Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Allowance for Doubtful Accounts	$ 8,138	$ 8,176
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)	9,415,191	7,670,216
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)	100,378,256	100,015,546
Common stock, outstanding (shares)	90,963,065	92,345,330
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	$ 35,207	$ 39,147
Current \| Senior Secured Credit Agreement \| Term Loan Facility
Unamortized discounts and debt issuance costs	7,938	7,979
Noncurrent \| Senior Secured Credit Agreement \| Term Loan Facility
Unamortized discounts and debt issuance costs	$ 44,271	$ 48,809

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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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