Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2019

Stock-Based Compensation

Schedule of stock-based compensation

	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Stock-based compensation expense	$	917	$	1,024	$	5,053	$	7,461

Summary of stock option activity

	Three Months Ended September 30, 2019			Nine Months Ended September 30, 2019
		Weighted-			Weighted-
		Average			Average
		Grant Date			Grant Date
	Number of RSUs	Fair Value		Number of RSUs	Fair Value
RSUs outstanding at beginning of period	553	$	56.23	352	$	58.17
RSUs granted	18	$	57.01	377	$	52.18
RSUs vested	(7)	$	27.69	(153)	$	50.90
RSUs forfeited	(30)	$	58.27	(42)	$	51.74
RSUs outstanding at end of period	534	$	56.52	534	$	56.52

Changes in the outstanding stock option awards during the three and nine months ended September 30, 2019 were as follows:

	Three Months Ended September 30, 2019			Nine Months Ended September 30, 2019
		Weighted-			Weighted-
		Average			Average
	Number of	Exercise Price		Number of	Exercise Price
	Options	per Share		Options	per Share
Options outstanding at beginning of period	213	$	21.50	230	$	20.73
Options exercised	(21)	$	22.90	(37)	$	18.03
Options expired	(1)	$	11.21	(2)	$	8.95
Options outstanding at end of period	191	$	21.37	191	$	21.37