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Capital Stock | 6 Months Ended
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Jun. 30, 2018
Equity [Abstract] |
Capital Stock | (11) 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 2017:
|  | Six Months Ended June 30, 2018 |  |  | Year Ended December 31, 2017 |
Beginning balance |  |  | 248,129,430 |  |  |  | 247,144,356 |
Restricted stock grants |  |  | 804,768 |  |  |  | 539,096 |
Restricted stock units vested |  |  | 411,959 |  |  |  | 344,937 |
Performance stock units issued |  |  | 76,149 |  |  |  | 85,461 |
Treasury shares issued |  |  | 4,900 |  |  |  | 15,580 |
Ending balance |  |  | 249,427,206 |  |  |  | 248,129,430 |

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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