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Shareholders' Equity | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Shareholders' Equity | Stockholders’ Equity Stock Repurchase - The Board has authorized three stock repurchase programs for the Company. The Company may purchase shares on the open market from time to time, up to a total of 5.7 million shares. The Board must authorize the timing and amount of these purchases. Effective May 24, 2016, the Board authorized up to $25.0 million in open market repurchases and on June 2, 2016, the Company executed a repurchase agreement in accordance with the rules and regulations of the SEC allowing the Company to repurchase an aggregate amount of $25.0 million or a total of approximately 2.0 million shares from the open market. The repurchase agreement expired on April 15, 2017. The Company also has a stock repurchase arrangement by which employee-participants in our 401(k) savings and investment plan are entitled to have shares in AAON, Inc. stock in their accounts sold to the Company. The maximum number of shares to be repurchased is contingent upon the number of shares sold by employee-participants. Lastly, the Company repurchases shares of AAON, Inc. stock from certain of its directors and employees for payment of statutory tax withholdings on stock transactions. A11 other repurchases from directors or employees are contingent upon Board approval. All repurchases are done at current market prices. Our repurchase activity is as follows:
| 2017 | 2016 | 2015
Program | Shares | Total $ | $ per share | Shares | Total $ | $ per share | Shares | Total $ | $ per share
Open market | 8,676 |  | $ | 283,654 |  | $ | 32.69 |  | 165,598 |  | $ | 4,440,658 |  | $ | 26.82 |  | 1,037,590 |  | $ | 24,999,963 |  | $ | 24.09 |
401(k) | 467,580 |  | 16,336,084 |  | 34.94 |  | 540,501 |  | 14,875,850 |  | 27.52 |  | 512,754 |  | 11,557,598 |  | 22.54 |
Directors and employees | 45,878 |  | 1,614,425 |  | 35.19 |  | 30,072 |  | 823,446 |  | 27.38 |  | 25,746 |  | 585,413 |  | 22.74 |
Total | 522,134 |  | $ | 18,234,163 |  | $ | 34.92 |  | 736,171 |  | $ | 20,139,954 |  | $ | 27.36 |  | 1,576,090 |  | $ | 37,142,974 |  | $ | 23.57 |
| Inception to Date
Program | Shares | Total $ | $ per share
Open market | 3,843,495 |  | $ | 61,232,115 |  | $ | 15.93 |
401(k) | 6,550,023 |  | 82,068,805 |  | 12.53 |
Directors and employees | 1,919,510 |  | 17,278,033 |  | 9.00 |
Total | 12,313,028 |  | $ | 160,578,953 |  | $ | 13.04 |
Dividends - At the discretion of the Board of Directors, we pay semi-annual cash dividends. Board approval is required to determine the date of declaration and amount for each semi-annual dividend payment. Our recent dividends are as follows:
Declaration Date | Record Date | Payment Date | Dividend per Share
May 19, 2015 | June 12, 2015 | July 1, 2015 | $0.11
October 29, 2015 | December 2, 2015 | December 23, 2015 | $0.11
May 24, 2016 | June 10, 2016 | July 1, 2016 | $0.11
November 9, 2016 | December 2, 2016 | December 23, 2016 | $0.13
May 16, 2017 | June 9, 2017 | July 7, 2017 | $0.13
November 7, 2017 | November 30, 2017 | December 21, 2017 | $0.13
We paid cash dividends of $13.7 million, $12.7 million and $11.9 million in 2017, 2016 and 2015, respectively.

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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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