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Stock-Based Compensation - Summary of Non-vested PSUs (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Weighted Average Grant Date Fair Value
Stock-based compensation expense	$ 2,868	$ 7,204	$ 4,712
Performance share units
Shares
Non-vested shares, Beginning balance (in shares)	169,334	142,357	89,578
Granted (in shares)	0	69,218	57,547
Vested (in shares)	(119,818)	(13,763)	0
Forfeited/Canceled (in shares)	0	(28,478)	(4,768)
Non-vested shares, Ending balance (in shares)	49,516	169,334	142,357
Weighted Average Grant Date Fair Value
Nonvested shares, Weighted Average Grant Date Fair Value, Beginning Balance (in usd per share)	$ 26.38	$ 30.65	$ 26.04
Non vested shares granted, Weighted Average Grant Date Fair Value (in usd per share)	0.00	20.10	37.45
Vested in period, Weighted Average Grant Date Fair Value (in usd per share)	26.87	30.52	0.00
Forfeited, Weighted Average Grant Date Fair Value (in usd per share)	0.00	30.44	26.04
Non-vested shares, Weighted Average Grant Date Fair Value, Ending Balance (in usd per share)	$ 25.20	$ 26.38	$ 30.65
Stock-based compensation expense	$ 456	$ 2,895	$ 1,983
Performance share units | Other
Weighted Average Grant Date Fair Value
Stock-based compensation expense	$ 200

X

- Definition

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.

+ References

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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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- 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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- Definition

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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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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