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Performance Based Equity Compensation	3 Months Ended
	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Performance Based Equity Compensation	Performance Based Equity Compensation The Company grants a combination of time-based and performance-based restricted stock units and stock options as part of its incentive compensation. Certain senior executives are eligible to receive performance-based awards. During the three months ended March 31, 2018, 0.8 million performance-based restricted stock units and 0.3 million performance-based stock options for shares of our Class C common stock were awarded under the Company's Second Amended and Restated 2005 Omnibus Long-Term Incentive Plan, as amended. The performance-based restricted stock units and options have weighted average grant date fair values of $15.41 and $6.91, respectively, and have vesting conditions tied to the achievement of an operating income target for 2018. Upon the achievement of the target, one fourth of the restricted stock units and options will vest each in February 2019, 2020, 2021 and 2022. During 2017, the Company granted performance-based restricted stock units and options with vesting conditions tied to the achievement of certain combined annual revenue and operating income targets for 2017 and 2018. As of March 31, 2018, the Company deemed the achievement of these targets improbable. As such, no expense for these awards has been recorded during the three months ended March 31, 2018.

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- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-URI http://asc.fasb.org/topic&trid=2228938

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 50
-URI http://asc.fasb.org/subtopic&trid=2208855

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- References

No definition available.

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