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Stock Incentive Plan and Other Equity Activity - Narrative (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Sale of Stock [Line Items]
Shares granted (in shares)	326
Shares issued under share-based compensation (in shares)	130
Stock-based compensation expense	$ 1,021	$ 617
Purchase of treasury stock	$ 3,201
Common Stock
Sale of Stock [Line Items]
Purchase of treasury stock (in shares)	250
Purchase of treasury stock	$ 3,201
Additional Paid in Capital
Sale of Stock [Line Items]
Stock-based compensation expense	$ 1,021	$ 617
Common Stock
Sale of Stock [Line Items]
Purchase of treasury stock (in shares)	(250)
Shares repurchased for tax withholding (in shares)	(52)
Treasury Stock
Sale of Stock [Line Items]
Purchase of treasury stock (in shares)	250
Purchase of treasury stock	$ 3,201
Stock-based compensation vesting, tax withholding amount	$ (564)
RSAs
Sale of Stock [Line Items]
Shares granted (in shares)	3
Weighted Average Grant-Date Fair Value per Share (in dollars per share)	$ 10.89
RSUs
Sale of Stock [Line Items]
Shares granted (in shares)	138
Weighted Average Grant-Date Fair Value per Share (in dollars per share)	$ 10.96
Shares issued under share-based compensation (in shares)	73
PSUs
Sale of Stock [Line Items]
Shares granted (in shares)	185
Weighted Average Grant-Date Fair Value per Share (in dollars per share)	$ 10.89
Shares issued under share-based compensation (in shares)	54

X

- Definition

The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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-Publisher FASB
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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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- Definition

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

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Net number of non-option equity instruments granted to participants.

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- Definition

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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