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Shareholders' Equity | 12 Months Ended
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Dec. 31, 2017
Shareholders’ Equity [Abstract] |
Shareholders' Equity | 5. Shareholders’ Equity Through December 31, 201 7, we had announced authorizations by our Board of Directors of repurchases of shares of common stock, which in the aggregate, authorized expenditures of up to $2,400,000. Under the remaining repurchase authorization s, shares may be purchased from time to time in open market transactions, subject to market conditions. The following table summarizes common stock repurchases under authorized programs: ﻿
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﻿ | Year ended December 31,
﻿ | 2017 |  | 2016 |  | 2015
﻿Shares of common stock repurchased |  | 805 |  |  | 1,811 |  |  | 839
﻿Total cost of common stock repurchased | $ | 284,318 |  | $ | 813,881 |  | $ | 485,841
﻿ As of December 31, 201 7, $118,274 was available to be repurchased under the authorized programs. The shares repurchased are being held in treasury until such time as they are reissued or retired, at the discretion of the Board of Directors. During 201 7, 201 6, and 201 5, shares of common stock were netted and surrendered as payment for minimum statutory tax withholding obligations in connection with the exercise and vesting of outstanding stock awards. We deem s hares surrendered by the participants in accordance with the applicable award agreements and plan as repurchased, but do not deem such shares to be part of publicly announced share repurchase programs.

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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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