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Stock-Based Compensation (Table) | 12 Months Ended
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Dec. 31, 2014
Stock-based compensation |
Stock-based compensation, fair value assumptions |
| 2014 |  | 2013 |  | 2012
Expected life | 4.5 years |  | 4.6-9.0 years |  | 4.5 years
Expected annual volatility rate | 28.0%-28.1% |  | 29.2%-39.6% |  | 40.7%-42.6%
Dividend yield | 0% |  | 0% |  | 0%
Risk-free interest rate | 1.4%-1.5% |  | 0.7%-2.4% |  | 0.5%-0.9%
Estimated annual forfeiture rate | 9.4% |  | 0.0%-8.1% |  | 0.0%-9.1%
Summary of stock options |
Common Share Options |  | Number of Options |  | Weighted Average Exercise Price |  | Weighted Average Grant Date Fair Value |  | Aggregate Intrinsic Value |  | Weighted Average Remaining Contractual Life (in years)
Outstanding at December 31, 2011 |  | 2,834,000 |  | $ | 43.07 |  |  |  |  |  |  |  |
(1,533,000 exercisable) |  |  |  |  | 46.23 |  |  |  |  |  |  |  |
| Granted |  | 677,000 |  |  | 34.91 |  | $ | 12.61 |  |  |  |  |
| Exercised |  | (47,000) |  |  | 29.82 |  |  |  |  | $ | 205,000 |  |
| Forfeited |  | (117,000) |  |  | 38.45 |  |  |  |  |  |  |  |
| Expired |  | (133,000) |  |  | 46.17 |  |  |  |  |  |  |  |
Outstanding at December 31, 2012 |  | 3,214,000 |  | $ | 41.58 |  |  |  |  |  |  |  |
(1,928,000 exercisable) |  |  |  |  | 43.99 |  |  |  |  |  |  |  |
| Granted |  | 1,213,000 |  |  | 32.45 |  | $ | 11.53 |  |  |  |  |
| Exercised |  | (892,000) |  |  | 34.78 |  |  |  |  | $ | 6,787,000 |  |
| Forfeited |  | (574,000) |  |  | 34.17 |  |  |  |  |  |  |  |
| Expired |  | (247,000) |  |  | 48.35 |  |  |  |  |  |  |  |
Outstanding at December 31, 2013 |  | 2,714,000 |  | $ | 42.22 |  |  |  |  |  |  |  |
(1,359,000 exercisable) |  |  |  | $ | 46.91 |  |  |  |  |  |  |  |
| Granted |  | 1,116,000 |  |  | 41.21 |  | $ | 10.68 |  |  |  |  |
| Exercised |  | (233,000) |  |  | 32.80 |  |  |  |  | $ | 1,966,000 |  |
| Forfeited |  | (144,000) |  |  | 35.09 |  |  |  |  |  |  |  |
| Expired |  | (65,000) |  |  | 45.68 |  |  |  |  |  |  |  |
Outstanding at December 31, 2014 |  | 3,388,000 |  | $ | 41.51 |  |  |  |  | $ | 7,495,000 |  | 6.70
(1,586,000 exercisable) |  |  |  | $ | 45.28 |  |  |  |  | $ | 2,984,000 |  | 4.40
Summary of nonvested restricted stock units |
Common Restricted Stock Units | Number |  | Weighted Average Grant Date Fair Value |
Nonvested at December 31, 2013 | 1,170,000 |  | $ | 36.46 |
Granted | 370,000 |  |  | 41.24 |
Vested | (274,000) |  |  | 41.92 |
Forfeited | (124,000) |  |  | 34.38 |
Nonvested at December 31, 2014 | 1,142,000 |  | $ | 35.60 |
Stock-based compensation |
Year Ended December 31, | 2014 |  | 2013 |  | 2012
(Dollars in thousands) |  |  |  |  |  |  |  |
Stock option awards | $ | 9,513 |  | $ | 5,810 |  | $ | 8,471
Restricted stock unit awards |  | 12,125 |  |  | 9,485 |  |  | 12,300
Deferred compensation bonus and matching stock unit awards |  | 185 |  |  | 2 |  |  | 240
Awards under Non-Employee Director compensation plan |  | 560 |  |  | 547 |  |  | 455
Total stock-based compensation, before income taxes |  | 22,383 |  |  | 15,844 |  |  | 21,466
Income tax benefit |  | (8,454) |  |  | (5,984) |  |  | (8,121)
Total stock-based compensation expense, net of income taxes | $ | 13,929 |  | $ | 9,860 |  | $ | 13,345
Stock-based compensation, allocation by financial statement line item |
December 31, |  | 2014 |  |  | 2013 |  |  | 2012
(Dollars in thousands) |  |  |  |  |  |  |  |
Selling, general and administrative expense | $ | 19,429 |  | $ | 12,933 |  | $ | 18,437
System operations |  | 2,954 |  |  | 2,911 |  |  | 3,029
Total stock-based compensation expense | $ | 22,383 |  | $ | 15,844 |  | $ | 21,466

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