Common Stock	6 Months Ended
Jun. 30, 2018
Equity [Abstract]
Common Stock	COMMON STOCK On January 18, 2018, the board of directors of the Company approved a two-for-one stock split of the Corporation’s outstanding Class A common stock (“Common Stock”) in the form of a 100% stock dividend for shareholders of record as of the close of business on January 30, 2018 (“Record Date”). The new shares were distributed by the Company’s transfer agent, Computershare, and the Company’s common stock began trading on a split-adjusted basis on the NASDAQ Global Select Market on February 9, 2018. All previously reported share and per share data included in filings subsequent to February 8, 2018 are restated to reflect the retroactive effect of this two-for-one stock split. On April 19, 2018, shareholders of the Company approved an increase in the number of authorized shares from 120,000,000 to 175,000,000. On July 23, 2012, the Company approved a stock repurchase program which authorized the repurchase of up to 1,700,000 shares (split adjusted) of Class A common stock, or approximately 2% of the shares outstanding. Under the current plan, the Company can repurchase an additional 308,272 shares. The shares are to be purchased from time to time at prevailing market prices, through open market or unsolicited negotiated transactions, depending upon market conditions. Under the repurchase program, there is no time limit for the stock repurchases, nor is there a minimum number of shares that the Company intends to repurchase. The Company may discontinue purchases at any time that management determines additional purchases are not warranted. The Company intends to use the repurchased shares to satisfy stock option exercises, payment of future stock awards and dividends and general corporate purposes.

COMMON STOCK

On January 18, 2018, the board of directors of the Company approved a two-for-one stock split of the Corporation’s outstanding Class A common stock (“Common Stock”) in the form of a 100% stock dividend for shareholders of record as of the close of business on January 30, 2018 (“Record Date”). The new shares were distributed by the Company’s transfer agent, Computershare, and the Company’s common stock began trading on a split-adjusted basis on the NASDAQ Global Select Market on February 9, 2018. All previously reported share and per share data included in filings subsequent to February 8, 2018 are restated to reflect the retroactive effect of this two-for-one stock split.

On April 19, 2018, shareholders of the Company approved an increase in the number of authorized shares from 120,000,000 to 175,000,000.

On July 23, 2012, the Company approved a stock repurchase program which authorized the repurchase of up to 1,700,000 shares (split adjusted) of Class A common stock, or approximately 2% of the shares outstanding. Under the current plan, the Company can repurchase an additional 308,272 shares. The shares are to be purchased from time to time at prevailing market prices, through open market or unsolicited negotiated transactions, depending upon market conditions. Under the repurchase program, there is no time limit for the stock repurchases, nor is there a minimum number of shares that the Company intends to repurchase. The Company may discontinue purchases at any time that management determines additional purchases are not warranted. The Company intends to use the repurchased shares to satisfy stock option exercises, payment of future stock awards and dividends and general corporate purposes.