Exhibit A Transactions in Shares During the Past Sixty (60) Days
Name of Reporting Person	Date of Transaction	Buy/Sell	Aggregate Amount of Securities	Share Price
Horizon Kinetics Asset Management LLC	18-Oct	BUY	6803	$  54.23
Horizon Kinetics Asset Management LLC	21-Oct	BUY	2077	$  54.46
Horizon Kinetics Asset Management LLC	22-Oct	BUY	1183	$  53.21
Horizon Kinetics Asset Management LLC	23-Oct	BUY	1590	$  52.53
Horizon Kinetics Asset Management LLC	23-Oct	SELL	224	$  52.50
Horizon Kinetics Asset Management LLC	24-Oct	BUY	1513	$  53.93
Horizon Kinetics Asset Management LLC	25-Oct	BUY	4810	$  53.62
Horizon Kinetics Asset Management LLC	28-Oct	BUY	1519	$  52.56
Horizon Kinetics Asset Management LLC	29-Oct	BUY	1349	$  53.78
Horizon Kinetics Asset Management LLC	30-Oct	BUY	1685	$  54.58
Horizon Kinetics Asset Management LLC	31-Oct	BUY	1752	$  56.06
Horizon Kinetics Asset Management LLC	1-Nov	BUY	3086	$  55.96
Horizon Kinetics Asset Management LLC	4-Nov	BUY	1777	$  56.59

Name of Reporting Person	Date of Transaction	Buy/Sell	Aggregate Amount of Securities	Share Price
Horizon Kinetics Asset Management LLC	4-Nov	SELL	4700	$  56.41
Horizon Kinetics Asset Management LLC	5-Nov	BUY	2574	$  58.30
Horizon Kinetics Asset Management LLC	6-Nov	BUY	4615	$  61.56
Horizon Kinetics Asset Management LLC	7-Nov	BUY	1298	$  67.09
Horizon Kinetics Asset Management LLC	8-Nov	BUY	1357	$  72.40
Horizon Kinetics Asset Management LLC	11-Nov	BUY	1151	$  69.97
Horizon Kinetics Asset Management LLC	14-Nov	BUY	21	$  68.00
Horizon Kinetics Asset Management LLC	15-Nov	BUY	748	$  67.02
Horizon Kinetics Asset Management LLC	18-Nov	BUY	11	$  69.98
Horizon Kinetics Asset Management LLC	18-Nov	SELL	49	$  69.99
Horizon Kinetics Asset Management LLC	19-Nov	BUY	111527	$  62.33
Horizon Kinetics Asset Management LLC	20-Nov	BUY	84590	$  63.71
Horizon Kinetics Asset Management LLC	20-Nov	SELL	61750	$  63.03
Horizon Kinetics Asset Management LLC	21-Nov	BUY	9456	$  67.43
Horizon Kinetics Asset Management LLC	21-Nov	SELL	10270	$  66.71

Name of Reporting Person	Date of Transaction	Buy/Sell	Aggregate Amount of Securities	Share Price
Horizon Kinetics Asset Management LLC	22-Nov	BUY	20115	$  71.26
Horizon Kinetics Asset Management LLC	22-Nov	SELL	21600	$  74.62
Horizon Kinetics Asset Management LLC	25-Nov	BUY	1106	$  76.70
Horizon Kinetics Asset Management LLC	26-Nov	BUY	328	$  76.99
Horizon Kinetics Asset Management LLC	27-Nov	BUY	168	$  79.61
Horizon Kinetics Asset Management LLC	29-Nov	BUY	2240	$  78.89
Horizon Kinetics Asset Management LLC	29-Nov	SELL	11	$  76.40
Horizon Kinetics Asset Management LLC	2-Dec	BUY	14914	$  71.72
Horizon Kinetics Asset Management LLC	3-Dec	BUY	1330	$  73.09
Horizon Kinetics Asset Management LLC	4-Dec	BUY	4289	$  72.18
Horizon Kinetics Asset Management LLC	4-Dec	SELL	4002	$  71.57
Horizon Kinetics Asset Management LLC	5-Dec	BUY	4011	$  70.59
Horizon Kinetics Asset Management LLC	5-Dec	SELL	36	$  70.39
Horizon Kinetics Asset Management LLC	6-Dec	BUY	267	$  64.88
Horizon Kinetics Asset Management LLC	6-Dec	SELL	267	$  63.99

Name of Reporting Person	Date of Transaction	Buy/Sell	Aggregate Amount of Securities	Share Price
Horizon Kinetics Asset Management LLC	9-Dec	BUY	1523	$  63.30
Horizon Kinetics Asset Management LLC	10-Dec	BUY	992	$  62.94
Horizon Kinetics Asset Management LLC	10-Dec	SELL	35	$  62.69
Horizon Kinetics Asset Management LLC	11-Dec	BUY	154	$  61.50
Horizon Kinetics Asset Management LLC	12-Dec	BUY	276	$  62.86
Horizon Kinetics Asset Management LLC	13-Dec	BUY	745	$  60.03
Horizon Kinetics Asset Management LLC	13-Dec	SELL	406	$  61.04
Horizon Kinetics Asset Management LLC	16-Dec	BUY	1414	$  59.50
Horizon Kinetics Asset Management LLC	17-Dec	BUY	4848	$  57.86
Horizon Kinetics Asset Management LLC	18-Dec	BUY	16856	$  58.49
Horizon Kinetics Asset Management LLC	19-Dec	BUY	119799.447	$  59.88