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Stock Based Compensation - Allocation of Compensation Expense (Details) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) plan shares	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Plan information
Number of plans | plan	2
Compensation expense
Restricted stock	$ 3,973	$ 3,466	$ 2,766
Long-term compensation plan	2,118	1,906	2,105
Total Compensation	$ 6,091	$ 5,372	$ 4,871
2009 Equity Incentive Plan
Plan information
Shares authorized for issuance | shares	6,032
Percentage of Shares issued and outstanding	15.00%

X

- Definition

The number of share-based plans.

+ References

No definition available.

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- Definition

Share based compensation arrangement by Share based payment award percentage of shares issued and outstanding as of the balance sheet date.

+ References

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- 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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- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

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- Definition

The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation.

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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