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Long-Term Compensation Plan and Stock Based Compensation - Additional Information (Details) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) shares
Restricted Stock, subject to performance criteria
Long-Term Compensation Plan and Stock Based Compensation
Unissued shares	161
Restricted Stock, subject to time-based criteria
Long-Term Compensation Plan and Stock Based Compensation
Stock based compensation awards issued shares	163
2009 Equity Incentive Plan | Restricted Stock
Long-Term Compensation Plan and Stock Based Compensation
Stock based compensation Awards	324
2009 Equity Incentive Plan | Restricted Stock, subject to performance criteria
Long-Term Compensation Plan and Stock Based Compensation
Unissued shares	161
Vesting period (in years)	3 years
Fair value of nonvested awards | $	$ 2,280
2009 Equity Incentive Plan | Restricted Stock, subject to time-based criteria
Long-Term Compensation Plan and Stock Based Compensation
Stock based compensation awards issued shares	163
Restricted stock awards, fair value | $	$ 2,299
2009 Equity Incentive Plan | Restricted Stock, subject to time-based criteria | Minimum
Long-Term Compensation Plan and Stock Based Compensation
Vesting period (in years)	1 year
2009 Equity Incentive Plan | Restricted Stock, subject to time-based criteria | Maximum
Long-Term Compensation Plan and Stock Based Compensation
Vesting period (in years)	4 years

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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Aggregate value of stock related to Restricted Stock Awards issued during the period.

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