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Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2012
Share-based Compensation [Abstract] |
Schedule Of Stock-Based Compensation Expense | Total compensation expense recognized in the consolidated financial statements for the three years ended December 31, 2012 for all share based awards, was as follows (in thousands):
| Year Ended December 31,
| 2012 |  | 2011 |  | 2010
Stock-based compensation expense | $ | 5,856 |  |  | $ | 5,597 |  |  | $ | 5,852 |
Schedule of Restricted Share Awards [Table Text Block] | Restricted Share Awards The activity for the three years ended December 31, 2012 related to our restricted share awards, excluding those subject to market conditions, was as follows:
| Year Ended December 31,
| 2012 |  | 2011 |  | 2010
| Shares |  | Wtd Avg Grant Fair Value |  | Shares |  | Wtd Avg Grant Fair Value |  | Shares |  | Wtd Avg Grant Fair Value
Vested at January 1 | 652,803 |  |  | $ | 30.06 |  |  | 490,832 |  |  | $ | 30.20 |  |  | 423,145 |  |  | $ | 30.24 |
Unvested at January 1 | 331,003 |  |  | 28.39 |  |  | 193,339 |  |  | 27.71 |  |  | 160,276 |  |  | 28.13 |
Granted | 36,884 |  |  | 26.40 |  |  | 303,168 |  |  | 29.48 |  |  | 101,870 |  |  | 28.37 |
Vested during year | (211,485 | ) |  | 28.39 |  |  | (161,971 | ) |  | 29.80 |  |  | (67,687 | ) |  | 30.01 |
Forfeited | (6,599 | ) |  | 27.61 |  |  | (3,533 | ) |  | 28.10 |  |  | (1,120 | ) |  | 28.45 |
Unvested at December 31 | 149,803 |  |  | 27.37 |  |  | 331,003 |  |  | 28.39 |  |  | 193,339 |  |  | 27.71 |
Vested at December 31 | 864,288 |  |  | 29.65 |  |  | 652,803 |  |  | 30.06 |  |  | 490,832 |  |  | 30.20 |
Fair Value of Share Grants Vested | The total fair value of share grants vested for the years ended December 31, 2012, 2011 and 2010 was $5.6 million, $4.9 million and $2.1 million, respectively.
Performance Share Units with Market Conditions [Table Text Block] | Stock based awards with market conditions under the LTIP were granted in February 2011 with fair market values, as determined using a Monte Carlo simulation, as follows (in thousands):
| Grant Date Fair Value
| Restricted |  | Unrestricted
Relative TSR | $ | 1,066 |  |  | $ | 1,066 |
Absolute TSR | 365 |  |  | 365 |
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, 2012 and 2011 was as follows (in thousands):
| December 31,
| 2012 |  | 2011
| Restricted |  | Unrestricted |  | Restricted |  | Unrestricted
Relative TSR | $ | 501 |  |  | $ | 338 |  |  | $ | 742 |  |  | $ | 826 |
Absolute TSR | 172 |  |  | 116 |  |  | 254 |  |  | 283 |
Schedule of Share-based Compensation, Stock Options, Activity | The previously issued and currently outstanding and exercisable stock options for the three years ended December 31, 2012 was as follows:
| Year Ended December 31,
| 2012 |  | 2011 |  | 2010
| Shares |  | Wtd Avg Ex Price |  | Shares |  | Wtd Avg Ex Price |  | Shares |  | Wtd Avg Ex Price
Outstanding at January 1 | 89,106 |  |  | $ | 27.69 |  |  | 145,950 |  |  | $ | 26.74 |  |  | 314,250 |  |  | $ | 25.39 |
Granted | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Exercised | (44,987 | ) |  | 25.61 |  |  | (51,081 | ) |  | 25.29 |  |  | (164,300 | ) |  | 24.11 |
Expired/Forfeited | (6,000 | ) |  | 25.61 |  |  | (5,763 | ) |  | 24.85 |  |  | (4,000 | ) |  | 28.23 |
Outstanding at December 31 | 38,119 |  |  | 30.48 |  |  | 89,106 |  |  | 27.69 |  |  | 145,950 |  |  | 26.74 |
Exercisable at December 31 | 38,119 |  |  | 30.48 |  |  | 89,106 |  |  | 27.69 |  |  | 145,950 |  |  | 26.74 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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 + 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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