STOCK BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Stock-Based Compensation Expense

The following table provides information regarding the amount and components of stock-based compensation expense, all of which is included in general and administrative expenses in the accompanying Condensed Consolidated Statements of Operations (in thousands):



	Three Months Ended June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
Restricted stock units ⁽¹⁾	$	2,294	$	1,755	$	4,191	$	3,138
Stock options	1,188		1,061		2,146		2,018
New TMM units	356		381		513		761
Total stock compensation	$	3,838	$	3,197	$	6,850	$	5,917

⁽¹⁾Includes compensation expense related to time-based RSUs and performance-based RSUs. Outstanding performance-based RSUs reflected in the table above are reported at target level of performance.

Summary of Activity of Stock Units

The shares of Class B Common Stock/New TMM Units held by members of management and members of our Board of Directors as of June 30, 2017 were as follows:



	Class B Shares/New TMM Units		Weighted Average Grant Date Fair Value
Balance at December 31, 2016	1,146,357		$	5.58
Exchanges ⁽¹⁾	(186,100	)	5.27
Forfeited ⁽²⁾	(1,592	)	8.04
Balance at June 30, 2017 ⁽³⁾	958,665		$	5.64

⁽¹⁾Exchanges during the period represent the exchange of a vested New TMM Unit along with the corresponding share of Class B Common Stock for a newly issued share of Class A Common Stock.

⁽²⁾Awards forfeited during the period represent the unvested portion of New TMM Unit awards for employees who have terminated employment with the Company and for which the New TMM Unit and the corresponding Class B Share have been canceled.

⁽³⁾ The number of vested and unexchanged New TMM Units as of June 30, 2017 was 936,695.

The following table summarizes the time-based RSU and performance-based RSU activity for the six months ended June 30, 2017:



	Shares		Weighted Average Grant Date Fair Value
Balance at December 31, 2016	1,358,701		$	13.39
Granted	644,629		18.04
Vested	(76,585	)	17.34
Forfeited	(37,559	)	13.41
Balance at June 30, 2017	1,889,186		$	14.82

Summary of Stock Option Activity

The following table summarizes the stock option activity for the six months ended June 30, 2017:



	Shares		Weighted Average Exercise Price Per Share
Outstanding at December 31, 2016	2,431,347		$	17.09
Granted	785,132		19.03
Exercised	(261,336	)	18.12
Canceled/Forfeited	(54,912	)	17.86
Outstanding at June 30, 2017	2,900,231		$	17.52
Options exercisable at June 30, 2017	918,087		$	19.62