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Stock-Based Compensation (Schedule of Shares and Units of Restricted Common Stock) (Details) - Restricted Stock Units (RSUs) shares in Thousands	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Number of Shares/Units
Outstanding at beginning of period — unvested (in shares) | shares	4,267
Granted (in shares) | shares	1,957
Cancelled (in shares) | shares	(252)
Vested (in shares) | shares	(2,141)
Outstanding at end of period — unvested (in shares) | shares	3,831
Weighted Average Grant Date Fair Value
Outstanding at beginning of period — unvested (in usd per share) | $ / shares	$ 13.12
Granted (in usd per share) | $ / shares	16.08
Cancelled (in usd per share) | $ / shares	11.98
Vested (in usd per share) | $ / shares	14.22
Outstanding at end of period — unvested (in usd per share) | $ / shares	$ 14.03

X

- Definition

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

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- Definition

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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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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