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Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2015
Share-based Compensation [Abstract] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The assumptions used to value the officer LTIP awards were as follows:
| 2015 Awards |  | 2014 Awards
Expected volatility (1) | 17.2 - 17.5% |  | 23.2 | %
Risk-free interest rate (2) | 1.0 - 1.1% |  | 0.8 | %
Expected term (3) | 3 and 4 years |  | 3 and 4 years |
Share price at grant date | $27.66 - $27.76 |  | $24.08
(1) Expected volatility based upon historical volatility of our daily closing share price. (2) Risk-free interest rate based on U.S. treasury constant maturity bonds on the measurement date with a maturity equal to the market condition performance period. (3) Expected term based on the market condition performance period.
Schedule of Restricted Share Awards [Table Text Block] | The activity for the three years ended December 31, 2015 related to our restricted share awards, excluding those subject to market conditions, was as follows:
| Shares |  | Wtd Avg Grant Fair Value
Unvested at December 31, 2012 | 149,803 |  |  | $ | 27.37 |
Granted | 141,609 |  |  | 26.30 |
Vested during year | (158,657 | ) |  | 26.66 |
Forfeited | (2,940 | ) |  | 27.80 |
Unvested at December 31, 2013 | 129,815 |  |  | 27.06 |
Granted | 210,817 |  |  | 23.93 |
Vested during year | (236,498 | ) |  | 25.06 |
Forfeited | (10,467 | ) |  | 25.80 |
Unvested at December 31, 2014 | 93,667 |  |  | 25.22 |
Granted | 251,642 |  |  | 27.80 |
Vested during year | (212,856 | ) |  | 27.18 |
Forfeited | (26,309 | ) |  | 26.77 |
Unvested at December 31, 2015 | 106,144 |  |  | 27.71 |
Performance Share Units with Market Conditions [Table Text Block] | Stock based awards with market conditions under the LTIP were granted in 2015 and 2014 with fair market values, as determined using a Monte Carlo simulation, as follows (in thousands):
| Grant Date Fair Value
| 2015 Awards |  | 2014 Awards
| Restricted |  | Unrestricted |  | Restricted |  | Unrestricted
Relative TSR | $ | 191 |  |  | $ | 634 |  |  | $ | 458 |  |  | $ | 1,376 |
Absolute TSR | 76 |  |  | 254 |  |  | 327 |  |  | 921 |
Schedule Of Unamortized Value Of Awards With Market Conditions [Table Text Block] | The unamortized value of these awards with market conditions as of December 31, 2015 was as follows (in thousands):
| 2015 Awards |  | 2014 Awards
| Restricted |  | Unrestricted |  | Restricted |  | Unrestricted
Relative TSR | $ | 144 |  |  | $ | 383 |  |  | $ | 161 |  |  | $ | — |
Absolute TSR | 57 |  |  | 153 |  |  | 111 |  |  | — |

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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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