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Equity-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2015
Equity-Based Compensation (Tables) |
Partnership Unit Award Activity Table |
|  | Units |  | Weighted Average Grant Date Fair Value Per Unit
|  | (In Thousands) |  |
Nonvested units outstanding at December 31, 2014 |  | 263 |  |  | $ | 21.89 |
Units granted(1) |  | 261 |  |  | 21.39 |
Units cancelled |  | (50 | ) |  | 20.49 |
Units vested |  | (73 | ) |  | 22.24 |
Nonvested units outstanding at December 31, 2015 |  | 401 |  |  | $ | 21.77 |
Stock Option Valuation Assumptions Table |
|  | Year Ended December 31,
|  | 2015 |  | 2014 |  | 2013
Expected stock price volatility |  | 49% to 51% |  |  | 44% to 45% |  |  | 54% to 74% |
Expected life of options |  | 4.6 years |  |  | 4.9 years |  |  | 4.9 years |
Risk free interest rate |  | 1.41% to 1.51% |  |  | .01% |  |  | 0.76% to 1.48% |
Expected dividend yield |  | — |  |  | — |  |  | — |
Stock Option Award Activity Table |
|  | Shares Under Option |  | Weighted Average Option Price Per Share |  | Weighted-Average Remaining Contractual Life |  | Aggregate Intrinsic Value (in thousands)
|  | (In Thousands) |  |  |  |  |  |
Outstanding at January 1, 2015 |  | 4,196 |  |  | $ | 11.96 |  |  |  |  |
Options granted |  | 742 |  |  | 7.14 |  |  |  |  |
Options cancelled |  | (438 | ) |  | 13.42 |  |  |  |  |
Options exercised |  | (68 | ) |  | 4.27 |  |  |  |  |
Options expired |  | (265 | ) |  | $ | 9.42 |  |  |  |  |
Outstanding at December 31, 2015 |  | 4,167 |  |  | $ | 11.23 |  |  | 5.8 |  | $ | 2,813 |
Expected to vest at December 31, 2015 |  | 3,937 |  |  | $ | 11.29 |  |  | 5.7 |  | $ | 2,734 |
Exercisable at December 31, 2015 |  | 3,050 |  |  | $ | 12.39 |  |  | 4.6 |  | $ | 2,422 |
Intrinsic value is the difference between the market value of our stock option multiplied by the number of stock options outstanding for those stock options where the market value exceeds their exercise price. The total intrinsic value of stock options exercised during December 31, 2015, 2014, and 2013, was approximately $0.2 million, $1.4 million, and $2.2 million, respectively.
Restricted Stock Award Activity Table |
|  | Shares |  | Weighted Average Grant Date Fair Value Per Share
|  | (In Thousands) |  |
Nonvested restricted shares outstanding at December 31, 2014 |  | 773 |  |  | $ | 10.54 |
Granted |  | 633 |  |  | 7.15 |
Vested |  | (493 | ) |  | 9.72 |
Cancelled/Forfeited |  | (35 | ) |  | 10.75 |
Nonvested restricted shares outstanding at December 31, 2015 |  | 878 |  |  | $ | 8.54 |

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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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- 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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