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Common Stock Issued and Outstanding (Tables) | 12 Months Ended
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Dec. 31, 2017
Stockholders' Equity and Common Stock Issued and Outstanding [Abstract] |
Activity in Number of Shares of Common Stock Issued and Outstanding |
﻿ |  |  |  |  |
﻿ |  |  |  |  |
﻿(Number of shares outstanding) | 2017 |  | 2016 |  | 2015
﻿Beginning of year | 172,202,177 |  | 172,034,711 |  | 177,499,513
﻿Stock options exercised 1 | – |  | – |  | 15,575
﻿Restricted stock awards 1 | 368,132 |  | 158,504 |  | 478,549
﻿Employee stock purchase and thrift plans | 2,564 |  | 8,962 |  | 8,387
﻿Treasury shares purchased | – |  | – |  | (5,967,313)
﻿ End of year | 172,572,873 |  | 172,202,177 |  | 172,034,711
﻿ 1 Shares issued upon exercise of stock options and award of restricted stock are less than the amount reflected in Note J due to withholdings for statutory income taxes owed upon issuance of shares.

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