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Capital Stock | 12 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Capital Stock |
(13) | 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. The following is a schedule of changes in the number of common shares outstanding since the beginning of 2016:
| Year Ended December 31, |
| 2018 |  |  | 2017 |  |  | 2016 |
Beginning balance |  | 248,129,430 |  |  |  | 247,144,356 |  |  |  | 169,316,460 |
MRD Merger |  | — |  |  |  | — |  |  |  | 77,042,749 |
Restricted stock grants |  | 865,095 |  |  |  | 539,096 |  |  |  | 490,609 |
Restricted stock units vested |  | 434,046 |  |  |  | 344,937 |  |  |  | 266,541 |
Performance stock units issued |  | 76,149 |  |  |  | 85,461 |  |  |  | — |
Shares retired |  | — |  |  |  | — |  |  |  | (739 | )
Treasury shares |  | 5,302 |  |  |  | 15,580 |  |  |  | 28,736 |
Ending balance |  | 249,510,022 |  |  |  | 248,129,430 |  |  |  | 247,144,356 |
Common Stock Dividends The board of directors declared quarterly dividends of $0.02 per common share for each of the four quarters of 2018, 2017 and 2016. The determination of the amount of future dividends, if any, to be declared and paid is at the sole discretion of the board of directors and will depend on our financial condition, earnings, capital requirements, levels of indebtedness, our future business prospects and other matters our board of directors deem relevant. Our bank credit facility and our senior subordinated notes allow for the payment of common dividends, with certain limitations.

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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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