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Shareholders' Equity | 9 Months Ended
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Sep. 30, 2018
Stockholders' Equity Note [Abstract] |
Shareholders' Equity | Shareholders’ Equity Stock-Based Compensation The Company has only non-qualified stock options outstanding under its equity compensation plans. All outstanding stock options have performance-based vesting provisions specific to each option grant that tie the vesting of the applicable stock options to the Company’s financial performance. The Company’s stock options vest at a rate of 50 percent when a specified diluted earnings per share target is achieved, and the remaining 50 percent when a second, higher specified diluted earnings per share target is achieved. Options do not vest due to the passage of time but solely as a result of achievement of the financial vesting targets. Options granted in December 2017 include a service condition which requires a minimum two or four year waiting period from the grant date along with the attainment of the applicable financial vesting target. Earnings per share targets are established at time of grant and exclude the impact of stock-based compensation and, for earnings per share targets for the options granted in December 2017, also exclude income tax expense. The targets are measured annually on December 31. The amount of stock-based compensation expense recognized in the period is based upon management’s estimate of when the earnings per share targets may be achieved. Any change in management’s estimate could result in the remaining amount of stock-based compensation expense to be accelerated, spread out over a longer period, or reversed. This may cause volatility in the recognition of stock-based compensation expense in future periods and could materially affect the Company’s earnings. The Company recognized stock-based compensation expense in its Consolidated Financial Statements in the three and nine months ended September 30, 2018 and 2017, respectively, as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Stock-based compensation expense | $ | 5,878 |  |  | $ | 7,088 |  |  | $ | 16,396 |  |  | $ | 19,527 |
Less: Deferred tax benefit | (1,311 | ) |  | (2,517 | ) |  | (3,556 | ) |  | (6,859 | )
Stock-based compensation expense, net of tax | $ | 4,567 |  |  | $ | 4,571 |  |  | $ | 12,840 |  |  | $ | 12,668 |
As of September 30, 2018, there was approximately $47,131 of unrecognized compensation cost remaining related to unvested employee stock options that management expects will vest and is being amortized. The Company issues new common shares associated with the exercise of stock options. The total intrinsic value of options exercised during the nine months ended September 30, 2018 was $123,365. The total options exercisable as of September 30, 2018 had an intrinsic value of $247,517. The total intrinsic value for options exercisable is calculated as the difference between the market value of the Company’s common stock as of September 30, 2018 and the weighted average exercise price of the options. The market value of the Company’s common stock as of September 30, 2018 was $61.10 as reported by the Nasdaq Stock Market, LLC. The weighted average exercise price of the options exercisable as of September 30, 2018 was $29.60. Total options that were outstanding as of September 30, 2018 were 14,040,000. Total options that were exercisable as of September 30, 2018 were 7,857,000. Common Stock Buyback The Company’s Board of Directors, under multiple authorizations, has authorized the repurchase of the Company’s common stock on the open market or through private transactions. The Company purchased 4,419,000 shares at a total cost of $289,536 during the nine months ended September 30, 2018, which reduced the total shares outstanding of common stock. The cost of stock purchases during the period includes the cost of certain transactions that settled in the following quarter. As of September 30, 2018, the Company had approximately $81,102 of authorization remaining for the purchase of common stock under the program. The Company immediately retires its common stock when purchased. Upon retirement, the Company reduces Capital in excess of par value for the average capital per share outstanding and the remainder is charged against Retained earnings. If the Company reduces its Retained earnings to zero, any subsequent purchases of common stock will be charged entirely to Capital in excess of par value. Cash Dividend On May 30, 2018, the Board of Directors declared a cash dividend of $0.30 per share on the Company's common stock, which was paid on June 22, 2018, to shareholders of record on June 14, 2018. Cash dividends declared during the nine months ended September 30, 2018 and 2017 were $47,139 and $44,264, 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://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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