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Equity Incentive Plans - Summary of non-vested restricted shares (Table) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Number of shares
Unvested at beginning of period	143,000	280,000	385,000
Granted	885,000	672,500	944,000
Vested	(756,962)	(809,500)	(1,049,000)
Unvested at end of period	271,038	143,000	280,000
Weighted Average Grant Date Fair Value
Unvested at beginning of period	$ 12.49	$ 8.09	$ 4.82
Granted	8.13	11.68	9.59
Vested	8.54	10.29	8.24
Unvested at end of period	$ 9.28	$ 12.49	$ 8.09

X

- Definition

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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- Definition

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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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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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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