Stock-Based Compensation - Additional Information (Details) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) employee $ / shares shares	Dec. 31, 2015 USD ($) employee $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of employees affected \| employee		27	37
Net increase in share-based compensation		$ 400	$ 3,400
Stock-based compensation	$ 2,209	2,762	6,462
Stock-based compensation expense	2,209	2,868	7,204
Reclassification and settlement of equity awards		899
Additional Paid-in Capital
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 2,209	2,762	$ 6,462
Reclassification and settlement of equity awards		$ 899
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) \| shares	191,076	363,758	127,943
Aggregate weighted average grant-date fair value of share granted	$ 1,800	$ 2,700	$ 1,900
Fair value of shares vested	1,700	2,100	2,900
Stock-based compensation expense	$ 1,400	$ 2,021	$ 2,909
Exercise price (in usd per share) \| $ / shares	$ 8.03	$ 11.96	$ 17.51
Restricted stock awards \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Restricted stock awards \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Contractual term	5 years
Options granted (in shares) \| shares	0	546,196	56,250
Expected term (in years)		2 years 7 months 6 days	5 years
Expiration period	5 years
Weighted-average grant-date fair value	$ 0	$ 500	$ 800
Options exercised (in shares) \| shares	0	0	0
Stock-based compensation expense	$ 672	$ 285	$ 658
Shares issued as a result of options exercised	$ 700	$ 500	$ 700
Stock appreciation rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Expected term (in years)	5 years		5 years
Granted (in shares) \| shares	0	243,750
Net increase in share-based compensation	$ 100
Aggregate weighted average grant-date fair value of share granted	0	$ 0
Stock-based compensation expense	$ 0	$ 106	$ 742
Exercise price (in usd per share) \| $ / shares	$ 0.00	$ 0.00
Stock appreciation rights \| Additional Paid-in Capital
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reclassification and settlement of equity awards	$ 900
Stock appreciation rights \| Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense			$ 500
Exercise price (in usd per share) \| $ / shares			$ 13.87
Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)			3 years
Granted (in shares) \| shares	0	0	69,218
Maximum number of common shares to be received by participant, percent	200.00%
Maximum reduction in number of common shares to be received by participants, percent	0.00%
Percent of award based on performance of total stockholder return	75.00%
Service period	3 years
Aggregate weighted average grant-date fair value of share granted	$ 0	$ 0	$ 1,400
Stock-based compensation expense	$ 137	$ 456	$ 2,895
Exercise price (in usd per share) \| $ / shares	$ 26.87	$ 26.87	$ 30.52
2010 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for issuance (in shares) \| shares	600,000
2017 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for issuance (in shares) \| shares	2,000,000

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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The number of employees affected by the modification of an equity-based compensation plan.

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Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options.

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Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Number of share options (or share units) exercised during the current period.

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