Note 5 - Stockholders' Equity

3 Months Ended

Mar. 31, 2017

Stockholders' Equity Note Disclosure [Text Block]

Note

Stockholders’ Equity

Repurchases

of Class A Common Stock

Repurchases of our Class A Common Stock occurred under a repurchase authorization granted by our Board of Directors and related to shares withheld as part of the vesting of restricted stock units ("RSUs"). In

February

2016,

our Board of Directors authorized the repurchase of up to

$250

million of our Class A common stock. Share repurchases under this authorization were as follows:

	Repurchases Occurring in the Three Months Ended March 31, 2017				Cumulative Repurchases as of March 31, 2017
	Shares		Average Price		Shares		Average Price
2016 Share Repurchase Authorization		62,000	$	96.94		775,725	$	81.12

As of

March

31,

2017,

we had

$187.1

million available for repurchases pursuant to our

2016

share repurchase authorization.

In addition, during the

first

three

months of

2017,

we repurchased

31,986

shares at an average price of

$99.34

per share, for a total of

$3.2

million, related to tax withholdings associated with the vesting of RSUs. The repurchase of shares related to tax withholdings associated with stock awards does not reduce the number of shares available for repurchase as approved by our Board of Directors.