Share-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2020

Share-based Payment Arrangement [Abstract]

Summary of Information about Restricted Stock Grants Outstanding

The following table summarizes information about outstanding restricted stock grants as of September 30, 2020: 

Grant	Shares Granted (in thousands)	Nonvested Shares (in thousands)	Vesting Schedule	Unearned Compensation		Remaining Period to Vesting (in months)
October 2017	303	51	3 equal annual installments commencing on October 20, 2018	$	40.3	1
October 2018	382	130	3 equal annual installments commencing on October 20, 2019	$	473.1	13
October 2019	12	10	3 equal annual installments commencing on October 20, 2020	$	51.5	25
January 2020	149	134	3 equal annual installments commencing on October 20, 2020	$	527.7	25
April 2020	646	520	3 equal annual installments commencing on December 31, 2022	$	947.7	27
June 2020	210	210	Fully vests as of December 12, 2021	$	432.8	14
June 2020	380	350	Fully vests as of June 12, 2022	$	772.9	20
June 2020	185	185	Fully vests on the sooner of June 15, 2021 or the 2021 Annual Meeting of Stockholders	$	310.6	8

Summary of Information about Restricted Stock Grants

The following table summarizes information about the restricted stock grants for the nine months ended September 30, 2020 and 2019: 

	Nine Months Ended September 30, 2019
	2020			2019
	Shares (in thousands)	Weighted- Average Grant-Date Fair Value		Shares (in thousands)	Weighted- Average Grant-Date Fair Value
Nonvested at beginning of the period	403	$	7.72	760	$	7.56
Granted	1,575	2.86		75	7.60
Vested	(184)	5.79		(68)	8.38
Forfeited	(204)	5.15		(21)	7.48
Nonvested at September 30	1,590	$	3.46	746	$	7.49