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Common Stock and Treasury Stock | 12 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Common Stock and Treasury Stock | 7. Common Stock and Treasury Stock In 2005, the Company’s board approved a stock repurchase program authorizing the Company, as market and business conditions warrant, to acquire its common stock and periodically authorize additional funds for the program. In February 2018, the board approved the repurchase of up to $200.0 million of the Company’s common stock, in place of the remaining purchase amounts previously authorized. The Company repurchased 2,346,427 shares for $54.5 million under the program for the year ended December 31, 2018. Under the program to date, the Company has repurchased 44,129,393 shares for approximately $547.8 million. As of December 31, 2018, the maximum remaining amount authorized for purchase under the stock repurchase program was $176.6 million. During the year ended September 30, 2006, the Company began to issue shares of treasury stock upon exercise of stock options, payment of earned performance shares, issuance of restricted share awards (“RSAs”), vesting of restricted share units (“RSUs”), and for issuances of common stock pursuant to the Company’s employee stock purchase plan. Treasury shares issued during the year ended December 31, 2016, included 797,140; 148,322; and 470,029 shares issued pursuant to stock option exercises, RSA grants, and retention restricted share award (“retention RSA”) grants, respectively. Treasury shares issued during the year ended December 31, 2017, included 1,204,559 and 560,174 shares issued pursuant to stock option exercises and RSA grants, respectively. Treasury shares issued during the year ended December 31, 2018, included 1,379,704 and 10,000 shares issued pursuant to stock option exercises and RSUs vested, respectively.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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