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Stock Based Compensation (Details) - 2017 Incentive Plan and 2012 Incentive Plan	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vested, Maximum Awarded Units | shares	(324,978)
Vested, Weighted Average Grant Date Fair Value | $ / shares	$ 15.21
Service Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Beginning balance - non-vested shares, Maximum Awarded Unit | shares	323,331
Granted, Maximum Awarded Units | shares	25,729
Vested, Maximum Awarded Units | shares	(261,105)
Forfeited, Maximum Awarded Units | shares	0
Ending balance - non-vested shares, Maximum Awarded Unit | shares	87,955
Beginning balance - non-vested shares, Weighted Average Grant Date Fair Value | $ / shares	$ 9.20
Granted, Weighted Average Grant Date Fair Value | $ / shares	14.83
Vested, Weighted Average Grant Date Fair Value | $ / shares	8.46
Forfeited, Weighted Average Grant Date Fair Value | $ / shares	0
Ending balance - non-vested shares, Weighted Average Grant Date Fair Value | $ / shares	$ 13.04
Performance Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Beginning balance - non-vested shares, Maximum Awarded Unit | shares	266,515
Granted, Maximum Awarded Units | shares	62,919
Vested, Maximum Awarded Units | shares	(63,873)
Forfeited, Maximum Awarded Units | shares	(61,733)
Ending balance - non-vested shares, Maximum Awarded Unit | shares	203,828
Beginning balance - non-vested shares, Weighted Average Grant Date Fair Value | $ / shares	$ 9.43
Granted, Weighted Average Grant Date Fair Value | $ / shares	14.31
Vested, Weighted Average Grant Date Fair Value | $ / shares	7.76
Forfeited, Weighted Average Grant Date Fair Value | $ / shares	7.76
Ending balance - non-vested shares, Weighted Average Grant Date Fair Value | $ / shares	$ 11.96

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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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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