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Capital Stock | 6 Months Ended
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Jun. 30, 2021
Equity [Abstract] |
Capital Stock | (15) CAPITAL STOCK We have authorized capital stock of 485.0 million shares which includes 475.0 million shares of common stock and 10.0 million shares of preferred stock. We currently have no preferred stock issued or outstanding. The following is a schedule of changes in the number of common shares outstanding since the beginning of 2020:
|  | Six Months Ended June 30, 2021 |  |  | Year Ended December 31, 2020 |
Beginning balance |  |  | 246,348,092 |  |  |  | 249,630,803 |
Restricted stock grants |  |  | 1,286,737 |  |  |  | 3,390,358 |
Restricted stock units vested |  |  | 1,483,436 |  |  |  | 1,226,473 |
Performance stock units issued |  |  | 640,468 |  |  |  | 279,420 |
Performance stock dividends |  |  | 13,966 |  |  |  | 18,700 |
Treasury shares |  |  | 1,112 |  |  |  | (8,197,662 | )
Ending balance |  |  | 249,773,811 |  |  |  | 246,348,092 |
Stock Repurchase Program In October 2019, our Board of Directors authorized a $100.0 million common stock repurchase program. Under this program, we may repurchase shares in open market transactions, from time to time, in accordance with applicable SEC rules and federal securities laws. The following is a schedule of the change in treasury shares for the three and six months ended June 30, 2021:
|  | Three Months Ended June 30, 2021 |  |  | Six Months Ended June 30, 2021 |
Beginning balance |  |  | 10,004,683 |  |  |  | 10,005,795 |
Rabbi trust shares distributed/sold |  |  | — |  |  |  | (1,112 | )
Shares repurchased |  |  | — |  |  |  | — |
Ending balance |  |  | 10,004,683 |  |  |  | 10,004,683 |

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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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