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Stock-Based Compensation (Table) | 12 Months Ended
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Dec. 31, 2011
Stock based compensation |
Stock-based compensation |
Year Ended December 31, | 2011 |  |  | 2010 |  |  | 2009 |
(Dollars in thousands) |  |  |  |  |  |  |  |  |  |  |
Stock option awards | $ | 9,549 |  |  | $ | 7,179 |  |  | $ | 7,024 |
Restricted stock unit awards |  | 10,037 |  |  |  | 10,056 |  |  |  | 8,640 |
Deferred compensation matching stock unit awards |  | 12 |  |  |  | 165 |  |  |  | 151 |
Awards under employee stock purchase plan |  | 255 |  |  |  | 314 |  |  |  | 241 |
Awards under Non-Employee Director compensation plan |  | 330 |  |  |  | 330 |  |  |  | 306 |
Total stock-based compensation, before income taxes |  | 20,183 |  |  |  | 18,044 |  |  |  | 16,362 |
Income tax benefit |  | (7,581 | ) |  |  | (6,812 | ) |  |  | (6,154 | )
Total stock-based compensation expense, net of income taxes | $ | 12,602 |  |  | $ | 11,232 |  |  | $ | 10,208 |
Stock-based compensation, allocation by financial statement line item |
December 31, |  | 2011 |  |  | 2010 |  |  | 2009
(Dollars in thousands) |  |  |  |  |  |  |  |
Selling, general and administrative expense | $ | 17,538 |  | $ | 16,009 |  | $ | 14,512
System operations |  | 2,645 |  |  | 2,035 |  |  | 1,850
Total stock-based compensation expense | $ | 20,183 |  | $ | 18,044 |  | $ | 16,362
Common Shares | 2005 Long-Term Incentive Plan |
Stock based compensation |
Stock-based compensation, fair value assumptions |
| 2011 |  | 2010 |  | 2009
Expected life | 4.3 years |  | 0.9-8.0 years |  | 3.9 years
Expected volatility | 43.4%-44.8% |  | 26.9%-43.9% |  | 40.3%-44.2%
Dividend yield | 0% |  | 0% |  | 0%
Risk-free interest rate | 0.7%-2.0% |  | 0.4%-3.1% |  | 1.2%-2.2%
Estimated annual forfeiture rate | 0.0%-7.8% |  | 0.0%-8.4% |  | 6.9%
Summary of stock options |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Weighted
|  |  |  |  |  |  |  |  |  |  |  |  |  | Average
|  |  |  |  | Weighted |  | Weighted |  |  |  |  | Remaining
|  |  |  |  | Average |  | Average |  | Aggregate |  | Contractual
| Number of |  |  | Exercise |  | Grant Date |  | Intrinsic |  | Life
| Options |  |  | Price |  | Fair Value |  | Value |  | (in years)
Outstanding at December 31, 2008 |  | 1,626,000 |  |  | $ | 57.15 |  |  |  |  |  |  |  |
(624,000 exercisable) |  |  |  |  |  | 51.56 |  |  |  |  |  |  |  |
Granted |  | 748,000 |  |  |  | 34.21 |  | $ | 11.75 |  |  |  |  |
Exercised |  | (181,000 | ) |  |  | 34.01 |  |  |  |  | $ | 821,000 |  |
Forfeited |  | (130,000 | ) |  |  | 47.98 |  |  |  |  |  |  |  |
Expired |  | (34,000 | ) |  |  | 56.84 |  |  |  |  |  |  |  |
Outstanding at December 31, 2009 |  | 2,029,000 |  |  | $ | 51.37 |  |  |  |  |  |  |  |
(1,046,000 exercisable) |  |  |  |  |  | 54.40 |  |  |  |  |  |  |  |
Granted |  | 831,000 |  |  |  | 41.98 |  | $ | 13.75 |  |  |  |  |
Exercised |  | (317,000 | ) |  |  | 38.60 |  |  |  |  | $ | 1,555,000 |  |
Forfeited |  | (88,000 | ) |  |  | 44.28 |  |  |  |  |  |  |  |
Expired |  | (193,000 | ) |  |  | 61.50 |  |  |  |  |  |  |  |
Outstanding at December 31, 2010 |  | 2,262,000 |  |  | $ | 49.12 |  |  |  |  |  |  |  |
(1,151,000 exercisable) |  |  |  |  | $ | 54.64 |  |  |  |  |  |  |  |
Granted |  | 595,000 |  |  |  | 51.70 |  | $ | 19.42 |  |  |  |  |
Exercised |  | (173,000) |  |  |  | 37.50 |  |  |  |  | $ | 2,099,000 |  |
Forfeited |  | (72,000) |  |  |  | 45.97 |  |  |  |  |  |  |  |
Expired |  | (175,000) |  |  |  | 57.05 |  |  |  |  |  |  |  |
Outstanding at December 31, 2011 |  | 2,437,000 |  |  |  | 50.10 |  |  |  |  | $ | 4,423,000 |  | 6.9
(1,321,000 exercisable) |  |  |  |  |  | 53.68 |  |  |  |  | $ | 2,361,000 |  | 5.5
Summary of nonvested restricted stock units |
| Number |  |  | Weighted Average Grant Date Fair Value
Nonvested at December 31, 2010 | 752,000 |  |  | $ | 42.69
Granted | 346,000 |  |  |  | 49.35
Vested | (189,000 | ) |  |  | 55.93
Forfeited | (64,000 | ) |  |  | 42.48
Nonvested at December 31, 2011 | 845,000 |  |  | $ | 42.48

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