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Equity Incentive Program - RSUs (Details) - Restricted Stock Units (RSUs) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) $ / shares shares
Number of Shares (in shares):
Beginning balance | shares	390,939
Granted | shares	546,765
Assumed from Audience Acquisition | shares	432,254
Vested | shares	(217,316)
Forfeited | shares	(72,648)
Ending balance | shares	1,079,994
Weighted Average Grant Date Fair Value (in dollars per share):
Beginning balance | $ / shares	$ 28.41
Granted | $ / shares	18.48
Assumed from Audience Acquisition | $ / shares	17.92
Vested | $ / shares	20.82
Forfeited | $ / shares	20.00
Ending balance | $ / shares	$ 24.41
Unrecognized compensation expense | $	$ 15.3
Weighted average period for compensation expense to be recognized	1 year 4 months 15 days

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Options, Assumed from Acquisition

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Unrecognized cost of unvested share-based compensation awards.

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-Publisher FASB
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-Topic 718
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-Section 50
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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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