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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Income Tax Benefit Recognized for our Share-Based Compensation Arrangements | Compensation cost charged against income, primarily selling, general and administrative expense, and the income tax benefit recognized for our share-based compensation arrangements is included below:
|  | Years Ended December 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
|  | (In thousands) |
Total share-based compensation cost |  | $ | 17,745 |  |  | $ | 18,858 |  |  | $ | 14,854 |
Income tax benefit |  |  | 6,867 |  |  |  | 7,334 |  |  |  | 5,777 |
Fair Values for SARs and Stock Options Estimated on Grant Date Using Black-Scholes-Merton Option-Pricing Formula Which Incorporates Assumptions | We recognize compensation cost for all awards based on their fair values. The fair values for SARs and stock options are estimated on the grant date using the Black-Scholes-Merton option-pricing formula which incorporates the assumptions noted in the following table. Expected volatility is based on historical volatility, and expected term is based on historical exercise patterns of option holders. The fair value of restricted stock units with service vesting conditions or performance vesting conditions is the closing market price of our common stock on the date of grant. We estimate the fair value of certain restricted stock units with market conditions using a Monte Carlo simulation valuation model with the assistance of a third party valuation firm. Compensation costs for awards with service conditions are amortized to expense using the straight-line method. Compensation costs for awards with performance conditions and graded vesting are amortized to expense using the graded attribution method.
|  | Years Ended December 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
|  | (In thousands, except weighted average fair value and assumptions) |
Weighted-average fair value of SARs and options granted |  | $ | 31.22 |  |  | $ | 35.46 |  |  | $ | 24.63 |
Total intrinsic value of SARs converted and options exercised |  |  | 14,697 |  |  |  | 24,023 |  |  |  | 47,058 |
Cash received for options exercised |  |  | 30 |  |  |  | 48 |  |  |  | 14,030 |
Tax benefit related to share-based compensation |  |  | 5,050 |  |  |  | 6,859 |  |  |  | 10,734 |
Weighted-average fair value of restricted stock shares and units granted |  |  | 96.52 |  |  |  | 72.46 |  |  |  | 50.38 |
Total fair value of restricted stock shares and units vested |  |  | 7,696 |  |  |  | 7,888 |  |  |  | 9,032 |
Expected volatility |  |  | 35.66 | % |  |  | 52.63 | % |  |  | 53.94 | %
Expected term (in years) |  |  | 5.7 |  |  |  | 5.8 |  |  |  | 6.1 |
Risk-free rate |  |  | 1.59 | % |  |  | 1.79 | % |  |  | 1.04 | %
Dividend yield |  |  | 0.22 | % |  |  | 0.28 | % |  |  | 0.40 | %
Summary of Share Based Compensation Activity |
|  | SARs and Stock Options |  |  | Restricted Shares and Units |
|  | Number |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Term |  |  | Aggregate Intrinsic Value |  |  | Number |  |  | Weighted- Average Grant-Date Fair Value |
|  | (In thousands, except exercise prices, fair values, and contractual terms) |
Outstanding at January 1, 2015 |  |  | 1,305 |  |  | $ | 44.60 |  |  |  |  |  |  |  |  |  |  |  | 493 |  |  | $ | 54.76 |
Granted |  |  | 236 |  |  |  | 88.79 |  |  |  |  |  |  |  |  |  |  |  | 183 |  |  |  | 96.52 |
Exercised or converted |  |  | (320 | ) |  |  | 40.03 |  |  |  |  |  |  |  |  |  |  |  | (178 | ) |  |  | 43.11 |
Forfeited or expired |  |  | (32 | ) |  |  | 73.60 |  |  |  |  |  |  |  |  |  |  |  | (34 | ) |  |  | 70.99 |
Outstanding at December 31, 2015 |  |  | 1,189 |  |  | $ | 53.80 |  |  |  | 7.0 |  |  | $ | (7,280 | ) |  |  | 464 |  |  | $ | 74.50 |
Vested or expected to vest at December 31, 2015 |  |  | 1,169 |  |  | $ | 53.51 |  |  |  | 7.0 |  |  | $ | (6,811 | ) |  |  |  |  |  |  |  |
Exercisable or convertible at December 31, 2015 |  |  | 730 |  |  |  | 41.06 |  |  |  | 6.0 |  |  |  | 4,831 |  |  |  |  |  |  |  |  |
At December 31, 2015, the total unrecognized compensation cost related to all nonvested awards was $22.6 million. That cost is expected to be recognized over a weighted-average period of 1.8 years.

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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