Share-Based Compensation (Tables)

6 Months Ended

Jun. 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 June 30, 2020: 

Grant	Shares Granted (in thousands)	Unvested Shares (in thousands)	Vesting Schedule	Unearned Compensation		Remaining Period to Vesting (in months)
October 2017	303	53	3 equal annual installments commencing on October 20, 2018	$	168.1	4
October 2018	382	136	3 equal annual installments commencing on October 20, 2019	$	617.2	16
October 2019	12	12	3 equal annual installments commencing on October 20, 2020	$	63.4	28
January 2020	149	137	3 equal annual installments commencing on October 20, 2020	$	626.6	28
April 2020	646	546	3 equal annual installments commencing on December 31, 2022	$	1,105.8	30
June 2020	210	210	Fully vests as of December 12, 2021	$	525.6	17
June 2020	380	380	Fully vests as of June 12, 2022	$	965.0	23
June 2020	185	185	Fully vests as of June 12, 2021	$	427.1	11

Summary of Information about Nonvested Restricted Stock Grants

The following table summarizes information about the non-vested restricted stock grants for the six months ended June 30, 2020 and 2019: 

	Six Months Ended June 30,
	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	761	$	7.56
Granted	1,575	2.86		75	7.60
Vested	(184)	5.79		(68)	8.38
Forfeited	(135)	6.03		(20)	7.48
Nonvested at June 30	1,659	$	3.46	748	$	7.49