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Stock-Based Compensation Plans and Arrangements (Tables) | 12 Months Ended
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Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Black-Scholes Model Assumptions for Calculating Stock Option Fair Values | The fair values of the options granted in the years ended December 31, 2014 and 2013 were estimated as of the grant date using a Black-Scholes option pricing model with the following weighted average assumptions:
|  | Years Ended December 31,
(Dollars per share) |  | 2014 |  | 2013
Risk-free interest rate |  | 0.76 | % |  | 0.65 | %
Expected volatility |  | 26 | % |  | 31 | %
Expected dividend rate |  | 2.48 | % |  | 3.35 | %
Expected life of the option |  | 2.9 years |  |  | 2.8 years |
Weighted average fair value of options granted |  | $ | 3.48 |  |  | $ | 3.11 |
Stock Option Activity | The following table summarizes stock option activity for the year ended December 31, 2015.
(Dollars in thousands, except per share data) | Number of Options |  | Weighted Average Exercise Price per Share |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value(1)
Outstanding at December 31, 2014 | 16,155,119 |  |  | $ | 9.91 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Exercised(2)(3) | (2,709,554 | ) |  | 4.76 |  |  |  |  |
Canceled | (1,534,589 | ) |  | 17.69 |  |  |  |  |
Outstanding at December 31, 2015(4) | 11,910,976 |  |  | $ | 10.08 |  |  | 2.4 |  | $ | 10,214 |
Exercisable at December 31, 2015 | 10,599,378 |  |  | $ | 7.49 |  |  | 2.4 |  | $ | 10,137 |
(1) | The aggregate intrinsic value represents the total intrinsic value (the aggregate difference between our closing stock price on December 31, 2015 and the exercise price of in-the-money options) that would have been received by the option holders if all in-the-money options had been exercised on December 31, 2015.
(2) | The total intrinsic value of options exercised was $13.7 million, $11.4 million, and $8.5 million for the years ended December 31, 2015, 2014 and 2013, respectively.
(3) | No cash was received from option exercises for the year ended December 31, 2015. The actual tax benefit realized for the tax deductions from option exercises totaled $3.7 million for the year ended December 31, 2015.
(4) | For net-settled options, gross number is reflected.
Restricted Stock Activity | The following table summarizes restricted stock activity for the year ended December 31, 2015.
(Amounts in thousands, except per share data) | Number of Shares |  | Weighted Average Grant Date Fair Value
Non-vested at December 31, 2014 | 54,968 |  |  | $ | 9.12 |
Granted | 86,174 |  |  | 8.94 |
Vested(1) | (54,968 | ) |  | 8.19 |
Canceled | — |  |  | — |
Non-vested at December 31, 2015(2) | 86,174 |  |  | $ | 8.94 |
(1) | The total fair value of shares that vested during the years ended December 31, 2015, 2014 and 2013 was $0.5 million, $0.4 million and $0.6 million, respectively.
(2) | As of December 31, 2015, there was $0.4 million of unrecognized compensation cost related to restricted stock net of estimated forfeitures, which is expected to be recognized over a weighted average period of 0.5 years.
Restricted Stock Unit and Performance Stock Unit Activity | The following table summarizes RSU and PSU activity for the year ended December 31, 2015.
(Amounts in thousands, except per share data) | Number of RSUs/ PSUs |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2014 | 6,279,743 |  |  | $ | 10.95 |
Granted | 2,466,593 |  |  | 9.45 |
Vested and converted to common stock(1) | (2,796,739 | ) |  | 6.78 |
Canceled | (109,209 | ) |  | 8.57 |
Outstanding at December 31, 2015(2) | 5,840,388 |  |  | $ | 8.52 |
(1) | The total fair value of RSUs/PSUs that vested and converted to common stock during the years ended December 31, 2015, 2014 and 2013 was $18.9 million, $12.6 million and $6.4 million, respectively.
(2) | As of December 31, 2015, there was $13.8 million of unrecognized compensation cost related to RSUs net of estimated forfeitures, which is expected to be recognized over a weighted average period of 1.9 years.
Black-Scholes Model Assumptions for Calculating ESPP Fair Values | The fair values of the stock purchase rights of the ESPP offerings were calculated using a Black-Scholes option pricing model with the following weighted average assumptions.
| Years Ended December 31,
(Dollars per share) | 2015 |  | 2014 |  | 2013
Risk-free interest rate | 0.33 | % |  | 0.13 | % |  | 0.15 | %
Expected volatility | 27 | % |  | 25 | % |  | 29 | %
Expected dividend rate | — | % |  | — | % |  | 3.51 | %
Expected life of the option | 1 year |  |  | 1 year |  |  | 1 year |
Weighted average fair value of stock purchase rights | $ | 1.74 |  |  | $ | 1.66 |  |  | $ | 2.95 |

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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 employee stock purchase plans, including, but not limited to: (a) expected term, (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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