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Long-term Equity-based Compensation Plans (Tables)
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3 Months Ended |
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Mar. 31, 2012
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
The assumptions used in the Black-Scholes pricing model for options granted during the three months ended March 31, 2012 and 2011 were as follows: | | | | | | | | | | | | | | Three Months Ended | | Mar 31, 2012 | | Mar 31, 2011 | Range of Valuation Assumptions | | | | | | | | Expected Volatility | 29.36 | % | - | 53.84 | % | | 41.34 | % | - | 55.16 | % | Risk-free Interest Rate | 0.16 |
| - | 1.26 |
| | 1.30 |
| - | 2.87 |
| Expected Dividend Yield | 3.17 |
| - | 3.26 |
| | 3.38 |
| - | 3.38 |
| Weighted-Average Expected Life in Years | |
| | | | |
| | | Employee Grants | 1.0 |
| - | 7.0 |
| | 3.5 |
| - | 7.0 |
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| Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] |
Option and stock appreciation right activity for the three months ended March 31, 2012 is presented below: | | | | | | | | | | | | | | | | Shares Subject to Options | | Weighted- Average Exercise Price Per Share ($) | | Weighted- Average Remaining Contractual Life (in Years) | | Aggregate Intrinsic Value ($ in Millions) | Outstanding at Beginning of the Year | 3,632,398 |
| | $ | 40.70 |
| | | | | Granted | 229,451 |
| | 29.77 |
| | | | | Exercised | (6,250 | ) | | 17.36 |
| | | | | Forfeited or Expired | (20,500 | ) | | 43.64 |
| | | | | Outstanding at March 31, 2012 | 3,835,099 |
| | $ | 40.07 |
| | 4.33 |
| | $ | 6.7 |
| Vested and Expected to Vest at March 31, 2012 | 3,790,666 |
| | $ | 40.22 |
| | 4.28 |
| | $ | 6.6 |
| Exercisable at March 31, 2012 | 3,119,209 |
| | $ | 43.20 |
| | 3.30 |
| | $ | 3.9 |
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| Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
Information pertaining to options and stock appreciation rights outstanding at March 31, 2012 is presented below: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Outstanding | | Exercisable | Range of Exercise Prices | | Shares Subject to Options | | Weighted- Average Exercise Price Per Share ($) | | Weighted- Average Remaining Contractual Life (in Years) | | Shares Subject to Options | | Weighted- Average Exercise Price Per Share ($) | $ | 10.00 |
| - | $ | 15.00 |
| | 204,500 |
| | $ | 13.55 |
| | 6.85 |
| | 152,249 |
| | $ | 13.55 |
| 15.01 |
| - | 20.00 |
| | 8,000 |
| | 16.48 |
| | 7.10 |
| | 8,000 |
| | 16.48 |
| 20.01 |
| - | 25.00 |
| | 313,750 |
| | 23.74 |
| | 8.02 |
| | 118,875 |
| | 23.63 |
| 25.01 |
| - | 30.00 |
| | 612,949 |
| | 28.45 |
| | 8.61 |
| | 144,636 |
| | 26.82 |
| 30.01 |
| - | 35.00 |
| | 2,614 |
| | 31.18 |
| | 0.85 |
| | 2,163 |
| | 31.34 |
| 35.01 |
| - | 40.00 |
| | 341,577 |
| | 37.25 |
| | 5.70 |
| | 341,577 |
| | 37.25 |
| 40.01 |
| - | 45.00 |
| | 489,363 |
| | 43.33 |
| | 1.92 |
| | 489,363 |
| | 43.33 |
| 45.01 |
| - | 50.00 |
| | 1,369,021 |
| | 48.68 |
| | 2.82 |
| | 1,369,021 |
| | 48.68 |
| 50.01 |
| - | 55.00 |
| | 493,325 |
| | 51.12 |
| | 1.25 |
| | 493,325 |
| | 51.12 |
| 10.00 |
| - | 55.00 |
| | 3,835,099 |
| | 40.07 |
| | 4.33 |
| | 3,119,209 |
| | 43.20 |
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Performance-Based Restricted Stock [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
Activity related to nonvested performance-based restricted stock for the three months ended March 31, 2012 was as follows: | | | | | | | | | Performance-Based Restricted Shares | | Weighted- Average Grant-Date Fair Value Per Share | Nonvested Balance at Beginning of the Year | 172,875 |
| | $ | 29.86 |
| Granted | 68,575 |
| | 36.65 |
| Vested | (51,596 | ) | | 14.04 |
| Forfeited | (1,054 | ) | | 26.79 |
| Nonvested Balance at End of Period | 188,800 |
| | $ | 36.67 |
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Time-Based Restricted Stock [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
Activity related to nonvested time-based restricted stock for the three months ended March 31, 2012 was as follows: | | | | | | | | | Time-Based Restricted Shares | | Weighted- Average Grant-Date Fair Value Per Share | Nonvested Balance at Beginning of the Year | 116,784 |
| | $ | 23.33 |
| Granted | 57,625 |
| | 29.71 |
| Vested | (6,500 | ) | | 25.12 |
| Forfeited | (12,371 | ) | | 25.74 |
| Nonvested Balance at End of Period | 155,538 |
| | $ | 25.43 |
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