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Incentive Compensation Plans Summary of Stock Options Assumptions (Tables) | 12 Months Ended
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Dec. 31, 2015
Summary of Stock Options Assumptions [Abstract] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The fair value of each option grant has been estimated with the following weighted-average assumptions.
|  | Year ended December 31, 2013
Expected volatility 1 |  | 40.2 | %
Expected term (years) 2 |  | 6.9 |
Risk-free interest rate 3 |  | 1.3 | %
Expected dividend yield 4 |  | 2.4 | %
1 | The expected volatility used to estimate the fair value of stock options awarded is based on a blend of: (i) historical volatility of our common stock for periods equal to the expected term of our stock options and (ii) implied volatility of tradable forward put and call options to purchase and sell shares of our common stock.
2 | The estimate of our expected term is based on the average of: (i) an assumption that all outstanding options are exercised upon achieving their full vesting date and (ii) an assumption that all outstanding options will be exercised at the midpoint between the current date (i.e., the date awards have ratably vested through) and their full contractual term. In determining the estimate, we considered several factors, including the historical option exercise behavior of our employees and the terms and vesting periods of the options.
3 | The risk-free interest rate is determined using the implied yield currently available for zero-coupon U.S. government issuers with a remaining term equal to the expected term of the options.
4 | The expected dividend yield was calculated based on an annualized dividend of $0.30 per share in 2013.

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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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