Our currently outstanding equity-based awards were issued under our Equity Plan which provides for the granting of stock options, stock appreciation rights, restricted stock, restricted stock units, dividend equivalent rights, and other equity-based awards or incentive awards.

Stock options granted may be either incentive stock options or non-qualified stock options. Vesting terms may vary with each grant, and stock option terms are generally five to ten years. We have outstanding equity-based awards in the form of stock options and restricted stock awards. All of our outstanding equity-based awards are classified as equity.

As of December 31, 2020, 2019 and 2018, we had 235,000 outstanding and exercisable stock options. At December 31, 2020, the stock options had a weighted average exercise price of $9.75 and a weighted average contractual term of 0.2 years.

At December 31, 2020, the exercise price of our outstanding and exercisable stock options exceeded the market price of our Common Stock, resulting in no intrinsic value. At December 31, 2019, the intrinsic value of outstanding and exercisable options was $0.6 million. At December 31, 2018, the exercise price of our outstanding and exercisable stock options exceeded the market price of our Common Stock, resulting in no intrinsic value.


	Number of Shares	Weighted Average Grant Date Fair Value per Share		Aggregate Current Value
				(in thousands)
Non-vested December 31, 2018	370,152	$	13.40
Granted	235,407	11.32
Vested	(154,801)	12.82
Forfeited	(2,291)	12.65
Non-vested December 31, 2019	448,467	12.51
Granted	299,562	8.47
Vested	(172,170)	13.31
Forfeited	(2,282)	8.64
Non-vested December 31, 2020	573,577	$	10.18	$	5,168

The awards granted to our non-executive employees generally vest over a four-year period based on continuous service (20% on the first, second and third anniversary of the grant date and 40% on the fourth anniversary of the grant date).

The awards granted to our executive officers generally vest over a three-year period based on continuous service (25% on the first and second anniversary of the grant date and 50% on the third anniversary of the grant date) or in certain circumstances upon a change in control.

The holders of these awards have the right to vote the related shares of Common Stock and receive all dividends declared and paid whether or not vested. The fair value of time-based restricted stock awards granted is calculated based on the market value of our Common Stock on the date of grant.

During the years ended December 31, 2020, 2019, and 2018, the total fair value of time-based restricted stock awards that vested was $2.3 million, $2.0 million and $2.8 million, respectively.


	Number of Shares	Weighted Average Grant Date Fair Value per Share		Aggregate Current Value
				(in thousands)
Non-vested December 31, 2018	708,227	$	14.75
Granted	302,327	12.81
Vested	(89,097)	13.77
Forfeited	(165,466)	13.77
Non-vested December 31, 2019	755,991	14.31
Granted	376,609	9.38

Forfeited	(210,361)	17.13
Non-vested December 31, 2020	922,239	$	11.65	$	8,309

Our performance-based restricted stock awards are market-based awards and are accounted for based on the fair value of our Common Stock on the grant date. The fair value of the performance-based restricted stock awards granted was estimated using a Monte Carlo simulation valuation model. These awards generally vest over a three-year period based on our percentile ranking within the SNL U.S. REIT Hotel Index at the end of the period or upon a change in control. The awards require continued service during the measurement period and are subject to the other conditions described in the Equity Plan or award document.

The number of shares the executive officers may earn under these awards range from zero shares to twice the number of shares granted based on our percentile ranking within the index at the end of the measurement period. In addition, a portion of the performance-based shares may be earned based on the Company's absolute total shareholder return calculated during the performance period.

The holders of these grants have the right to vote the granted shares of Common Stock and any dividends declared will be accumulated and will be subject to the same vesting conditions as the awards. Further, if additional shares are earned based on our percentile ranking within the index, dividend payments will be issued as if the additional shares had been held throughout the measurement period.

The fair value of performance-based restricted stock awards granted was estimated using a Monte Carlo simulation valuation model and the following assumptions:


	2020			2019			2018
Expected dividend yield	8.16		%	6.17		%	5.33		%
Expected stock price volatility	23.7		%	23.2		%	25.7		%
Risk-free interest rate	0.53		%	2.43		%	2.41		%
Monte Carlo iterations	100,000			100,000			100,000
Weighted average estimated fair value of performance-based restricted stock awards	$	9.38		$	12.81		$	13.73

The expected dividend yield was calculated based on our annual expected dividend payments at the time of grant. The expected volatility was based on historical price changes of our Common Stock for a period comparable to the performance period. The risk-free interest rates were interpolated from the Federal Reserve Bond Equivalent Yield rates for “on-the-run” U.S. Treasury securities.

During the years ended December 31, 2020 and 2019, we granted 93,810 and 40,455 shares of Common Stock, respectively, to our non-employee directors as a part of our director compensation program. These grants were made pursuant to our Equity Plan and were vested upon grant.

Equity-based compensation expense included in Corporate General and Administrative expense in the Consolidated Statements of Operations for the years ended December 31, 2020, 2019, and 2018 was as follows (in thousands):


	2020		2019		2018

Time-based restricted stock	$	2,470	$	2,327	$	2,384
Performance-based restricted stock	3,559		3,396		3,727
Director stock	447		496		554
	$	6,476	$	6,219	$	6,665

We recognize equity-based compensation expense ratably over the vesting terms. The amount of expense may be subject to adjustment in future periods due to a change in the forfeiture assumptions.

Unrecognized equity-based compensation expense for all non-vested awards pursuant to our Equity Plan was $7.4 million at December 31, 2020 as follows (in thousands):


	Total		2021		2022		2023		2024
Time-based restricted stock	$	3,140	$	1,855	$	1,037	$	232	$	16
Performance-based restricted stock	4,242		2,654		1,392		196		—
	$	7,382	$	4,509	$	2,429	$	428	$	16