Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2016

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

Stock Based Compensation Expense

The following table discloses the amount of stock-based compensation expense for the three-month periods ended March 31, 2016 and 2015:

	Three Months Ended March 31,
	2016		2015
Stock options	$	431	$	1,053
Restricted stock units		1,823		1,259
Performance stock units		2,498		327
Total stock-based compensation	$	4,752	$	2,639

Details of Stock Options Activity

The following table provides details of the stock option activity for the three months ended March 31, 2016:

	Number of
	Shares
Outstanding at December 31, 2015		668,132
Exercised		(138,486	)
Canceled		(4,398	)
Outstanding at March 31, 2016		525,248
Exercisable		411,021

Details of Nonvested Restricted Stock Units Activity

The following table provides details of the nonvested restricted stock unit activity for the three months ended March 31, 2016:

	Number of
	Restricted Stock
	Units
Nonvested at December 31, 2015		197,388
Granted		106,287
Vested		(33,458	)
Canceled		(987	)
Accrued dividend equivalents		778
Nonvested at March 31, 2016		270,008

Performance Based Units Earned under Long-Term Incentive Plan

The following table provides details of the nonvested performance stock units under the Company’s Long-Term Incentive Plan:

	Number of
	Performance Stock
	Units
Performance stock units outstanding at December 31, 2015		191,536
Granted		109,581
Canceled		(2,220	)
Accrued dividend equivalents		584
Performance stock units outstanding at March 31, 2016		299,481