Share-Based Compensation	6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Compensation	Share-Based Compensation As more fully discussed in Note 6 of the Company’s notes to the consolidated financial statements in its 2017 Annual Report on Form 10-K, the Company maintains various long-term incentive plans, which provide for the granting of stock options, stock appreciation rights (“SARs”), restricted stock, restricted stock units (“RSUs”), performance awards, dividend equivalents and other share-based awards. SARs represent a right to receive upon exercise an amount, payable in shares of common stock, equal to the excess, if any, of the fair market value of the Company’s common stock on the date of exercise over the base value of the grant. The terms of such SARs require net settlement in shares of common stock and do not provide for cash settlement. An RSU represents a contingent right to receive one share of the Company’s common stock at a future date. The majority of awards previously granted vest on a pro-rata basis for periods ranging from one to five years and are expensed accordingly on a straight-line basis. The Company issues new shares upon exercise or conversion of awards under these plans. Most awards may be exercised or converted to shares not earlier than twelve months nor later than ten years from the date of grant. At June 30, 2018, total compensation cost related to nonvested awards not yet recognized was approximately $48,924, as compared to $32,812 at December 31, 2017. The weighted-average period over which this compensation cost is expected to be recognized is approximately two years. The aggregate intrinsic value for SARs and RSUs outstanding at June 30, 2018 was approximately $99,878. At June 30, 2018, the aggregate intrinsic value for SARs and RSUs vested totaled approximately $35,996, and the weighted-average contractual lives for outstanding and exercisable SARs and RSUs were approximately five years. For the six months ended June 30, 2018, $9,035 of share-based compensation cost was recorded, as compared to $8,086 for the same six month period in the prior year. Options to purchase approximately 2,098,000 and 1,445,000 shares of common stock were outstanding but excluded from the computation of diluted earnings per share for the three and six month periods ended June 30, 2018, as compared to approximately 1,968,000 and 1,697,000 shares for the three and six month periods ended June 30, 2017. These options were excluded from the computation of diluted net income per common share because the options’ exercise prices were greater than the average market price of the common stock. During the six months ended June 30, 2018, the Company granted approximately 360,000 RSUs.

Share-Based Compensation

As more fully discussed in Note 6 of the Company’s notes to the consolidated financial statements in its 2017 Annual Report on Form 10-K, the Company maintains various long-term incentive plans, which provide for the granting of stock options, stock appreciation rights (“SARs”), restricted stock, restricted stock units (“RSUs”), performance awards, dividend equivalents and other share-based awards. SARs represent a right to receive upon exercise an amount, payable in shares of common stock, equal to the excess, if any, of the fair market value of the Company’s common stock on the date of exercise over the base value of the grant. The terms of such SARs require net settlement in shares of common stock and do not provide for cash settlement. An RSU represents a contingent right to receive one share of the Company’s common stock at a future date. The majority of awards previously granted vest on a pro-rata basis for periods ranging from one to five years and are expensed accordingly on a straight-line basis. The Company issues new shares upon exercise or conversion of awards under these plans. Most awards may be exercised or converted to shares not earlier than twelve months nor later than ten years from the date of grant. At June 30, 2018, total compensation cost related to nonvested awards not yet recognized was approximately $48,924, as compared to $32,812 at December 31, 2017. The weighted-average period over which this compensation cost is expected to be recognized is approximately two years. The aggregate intrinsic value for SARs and RSUs outstanding at June 30, 2018 was approximately $99,878. At June 30, 2018, the aggregate intrinsic value for SARs and RSUs vested totaled approximately $35,996, and the weighted-average contractual lives for outstanding and exercisable SARs and RSUs were approximately five years. For the six months ended June 30, 2018, $9,035 of share-based compensation cost was recorded, as compared to $8,086 for the same six month period in the prior year.

Options to purchase approximately 2,098,000 and 1,445,000 shares of common stock were outstanding but excluded from the computation of diluted earnings per share for the three and six month periods ended June 30, 2018, as compared to approximately 1,968,000 and 1,697,000 shares for the three and six month periods ended June 30, 2017. These options were excluded from the computation of diluted net income per common share because the options’ exercise prices were greater than the average market price of the common stock. During the six months ended June 30, 2018, the Company granted approximately 360,000 RSUs.