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Stock-Based Compensation Plans and Arrangements (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock option activity | The following table summarizes stock option activity for the year ended December 31, 2017.
(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, 2016 | 7,595,059 |  |  | $ | 10.43 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Exercised(2)(3) | (2,693,347 | ) |  | 5.80 |  |  |  |  |
Canceled | (440,719 | ) |  | 15.82 |  |  |  |  |
Outstanding at December 31, 2017(4) | 4,460,993 |  |  | $ | 11.34 |  |  | 1.2 years |  | $ | 26,413 |
Exercisable at December 31, 2017 | 4,460,993 |  |  | $ | 5.38 |  |  | 1.2 years |  | $ | 26,413 |
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(1) | The aggregate intrinsic value represents the total intrinsic value (the aggregate difference between our closing stock price on December 31, 2017 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, 2017.
(2) | The total intrinsic value of options exercised was $16.5 million, $9.3 million, and $13.7 million for the years ended December 31, 2017, 2016 and 2015, respectively.
(3) | Cash of $0.1 million was received from option exercises for the year ended December 31, 2017. The actual tax benefit realized for the tax deductions from option exercises totaled $2.7 million for the year ended December 31, 2017.
(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, 2017.
(Shares and per share amounts in actuals) | Number of Shares |  | Weighted Average Grant Date Fair Value
Non-vested at December 31, 2016 | 120,879 |  |  | $ | 6.37 |
Granted | 81,103 |  |  | 10.85 |
Vested(1) | (120,879 | ) |  | 6.37 |
Canceled | — |  |  | — |
Non-vested at December 31, 2017(2) | 81,103 |  |  | $ | 10.85 |
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(1) | The total fair value of shares that vested during the years ended December 31, 2017, 2016 and 2015 was $0.8 million, $0.8 million and $0.5 million, respectively.
(2) | As of December 31, 2017, there was $0.4 million of unrecognized compensation cost related to restricted stock, 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, 2017.
(Shares and per share amounts in actuals) | Number of RSUs/ PSUs |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2016 | 7,486,610 |  |  | $ | 7.21 |
Granted | 2,247,337 |  |  | 11.79 |
Vested and converted to common stock(1) | (3,765,803 | ) |  | 7.75 |
Canceled | (22,854 | ) |  | 8.82 |
Outstanding at December 31, 2017(2) | 5,945,290 |  |  | $ | 8.60 |
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(1) | The total fair value of RSUs/PSUs that vested and converted to common stock during the years ended December 31, 2017, 2016 and 2015 was $29.2 million, $22.2 million and $18.9 million, respectively.
(2) | As of December 31, 2017, there was $13.4 million of unrecognized compensation cost related to RSUs/PSUs, which is expected to be recognized over a weighted average period of 1.4 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) | 2017 |  | 2016 |  | 2015
Risk-free interest rate | 1.22 | % |  | 0.50 | % |  | 0.33 | %
Expected volatility | 32 | % |  | 32 | % |  | 27 | %
Expected dividend rate | — | % |  | — | % |  | — | %
Expected life of the option | 1 year |  |  | 1 year |  |  | 1 year |
Weighted average fair value of stock purchase rights | $ | 2.36 |  |  | $ | 1.53 |  |  | $ | 1.74 |

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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: 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=96867065&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=96867065&loc=d3e5070-113901 + Details
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