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Stock Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Weighted Average Fair Value of Options Granted | The fair value of each option grant is estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions used:
Grant Year |  | Dividend Yield |  |  | Expected Volatility |  |  | Risk Free Interest Rate |  |  | Expected Lives |
2014 |  |  | 2 | % |  |  | 48 | % |  |  | 1 | % |  |  | 6 |
2013 |  |  | 0 | % |  |  | 51 | % |  |  | 1 | % |  |  | 6 |
2012 |  |  | 0 | % |  |  | 52 | % |  |  | 2 | % |  |  | 5 |
Stock Option Transactions under Various Stock-Based Employee Compensation Plans | Information regarding the 1996 Plan for the year ended December 31, 2014 is as follows:
|  | Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Contractual Life |
Outstanding, beginning of year |  |  | 3,232,423 |  |  | $ | 32.89 |  |  |  |  |
Granted |  |  | 87,000 |  |  |  | 51.04 |  |  |  |  |
Exercised |  |  | (522,032 | ) |  |  | 31.12 |  |  |  |  |
Forfeited |  |  | (12,200 | ) |  |  | 43.89 |  |  |  |  |
Expired |  |  | (10,600 | ) |  |  | 28.13 |  |  |  |  |
Outstanding, end of year |  |  | 2,774,591 |  |  | $ | 33.76 |  |  |  | 6.66 |
Exercisable at end of year |  |  | 1,622,891 |  |  | $ | 27.54 |  |  |  | 5.63 |
Summary of ESPP Share Activity | The following is a summary of 2009 ESPP share activity for the year ended December 31, 2014:
|  | Shares |
Available for future purchases, January 1, 2014 |  |  | 327,689 |
Additional shares reserved under 2009 ESPP |  |  | 80,209 |
Purchases |  |  | (100,450 | )
Available for future purchases, December 31, 2014 |  |  | 307,448 |

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- Definition Tabular disclosure of employee stock purchase plan activity. + 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 (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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