Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Stock-Based Compensation

Summary of the restricted stock awards activity

	Year ended December 31,
	2020			2019			2018
			Weighted Average			Weighted Average			Weighted Average
	Shares		Grant Price	Shares		Grant Price	Shares		Grant Price
Outstanding, beginning of period	3,140,168	$	8.56	2,356,418	$	9.23	1,914,570	$	16.82
Granted	3,585,929		4.44	2,075,455		8.41	2,116,546		7.78
Vested	(1,154,151)		8.87	(825,764)		9.84	(1,242,930)		17.08
Forfeited	(580,975)		7.05	(465,941)		9.01	(431,768)		13.19
Outstanding, end of period(1)	4,990,971	$	5.71	3,140,168	$	8.56	2,356,418	$	9.23

(1) The total outstanding non-vested shares of restricted stock awards granted to employees and directors are included in total outstanding shares as of December 31, 2020, 2019 and 2018.