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Common Stock and Treasury Stock | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Common Stock and Treasury Stock | Common Stock and Treasury Stock In 2005, the 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 the Company's common stock of up to $200.0 million, in place of the remaining purchase amounts previously authorized. The Company repurchased 1,000,000 shares for $28.9 million under the program for the year ended December 31, 2020. Under the program to date, the Company has repurchased 46,357,495 shares for approximately $612.3 million. As of December 31, 2020, the maximum remaining amount authorized for purchase under the stock repurchase program was $112.1 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 (LTIP performance shares and TSRs), vesting of RSUs, and for issuances of common stock pursuant to the Company’s ESPP. Treasury shares issued by award type are as follows:
| Years Ended December 31,
| 2020 |  | 2019 |  | 2018
Stock options | 1,756,471 |  |  | 854,524 |  |  | 1,379,704 |
LTIP performance shares | 668,240 |  |  | — |  |  | — |
TSRs | 199,413 |  |  | — |  |  | — |
RSUs | 431,504 |  |  | 259,634 |  |  | 10,000 |
ESPP | 151,542 |  |  | 126,983 |  | 148,520
Total treasury shares issued | 3,207,170 |  |  | 1,241,141 |  |  | 1,538,224 |

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: 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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