Stock-Based Compensation Plans and Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2019

Share-based Payment Arrangement [Abstract]

Summary of unvested restricted stock under the Carbon Plans

				Weighted Average
	Number of Shares			Grant Date Fair Value
Restricted stock awards, unvested, January 1, 2018		269,997		$	7.54
Granted		106,000			9.80
Vested		(59,550	)		6.82
Forfeited		(2,240	)		7.41
Restricted stock awards, unvested, December 31, 2018		314,207		$	8.40
Granted		99,000			10.00
Vested		(105,628	)		6.75
Forfeited		(6,682	)		9.74
Restricted stock awards, unvested, December 31, 2019		300,897		$	9.41

Summary of unvested performance units

	Number
	of Shares
Restricted performance units, unvested, January 1, 2018		258,811
Granted		136,159
Vested		(108,484	)
Forfeited		(6,610	)
Restricted performance units, unvested, December 31, 2018		279,876
Granted		101,864
Vested		(95,451	)
Forfeited		(11,084	)
Restricted performance units, unvested, December 31, 2019		275,205