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Employee Share Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Schedule of Fair Value Option Award Weighted Average Assumptions Used | We utilized the Black-Scholes-Merton option-pricing model to determine the fair value of stock options on the date of grant. The fair value of stock options granted during the years ended December 31, 2017, 2016 and 2015 were $3.49, $2.40, $2.34, respectively. The following weighted average assumptions were utilized:
|  | 2017 |  |  | 2016 |  |  | 2015 |
Expected volatility (1) |  |  | 22.22% |  |  |  | 24.88 | % |  |  | 26.65 | %
Expected option life (years) (2) |  |  | 4.61 |  |  |  | 4.62 |  |  |  | 4.64 |
Risk-free interest rate (3) |  |  | 1.85% |  |  |  | 1.12 | % |  |  | 1.32 | %
Expected dividend yield (4) |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
(1) | The expected volatility assumption was determined based upon the historical volatility of our stock price, using daily price intervals.
(2) | The expected option life was determined based upon our historical data using a midpoint scenario, which assumes all options are exercised halfway between the expiration date and the weighted average time it takes the option to vest.
(3) | The risk-free interest rate assumption was upon zero-coupon U.S. Treasury bonds with a term approximating the expected life of the respective options.
(4) | The expected dividend yield assumption was determined in view of our historical and estimated dividend payouts. We do not expect to change our dividend payout policy in the foreseeable future.
Schedule of Share-Based Compensation Awards | During the years ended December 31, 2017, 2016 and 2015, we recognized compensation expense for these awards as follows (in thousands):
|  | 2017 |  |  | 2016 |  |  | 2015 |
Stock options |  | $ | 2,105 |  |  | $ | 2,253 |  |  | $ | 2,541 |
Restricted stock awards |  |  | 3,600 |  |  |  | 3,472 |  |  |  | 3,188 |
Total share-based compensation expense before income tax benefit |  | $ | 5,705 |  |  | $ | 5,725 |  |  | $ | 5,729 |
Stock Award Activity | Stock option activity during the year ended December 31, 2017 was as follows (number of options in thousands):
|  | Number of Options |  |  | Weighted Average Exercise Price Per Share |  |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value (in millions) |
Outstanding at December 31, 2016 |  |  | 4,376 |  |  | $ | 8.02 |  |  |  |  |  |  |
Granted |  |  | 654 |  |  | $ | 15.54 |  |  |  |  |  |  |
Exercised |  |  | (1,176 | ) |  | $ | 6.81 |  |  |  |  |  |  |
Expired or canceled |  |  | (10 | ) |  | $ | 7.79 |  |  |  |  |  |  |
Outstanding at December 31, 2017 |  |  | 3,844 |  |  | $ | 9.67 |  |  | 3.15 years |  | $ | 22.3 |
Vested and exercisable at December 31, 2017 |  |  | 2,004 |  |  | $ | 7.85 |  |  | 2.20 years |  | $ | 15.2 |
Roll Forward of RSU Activity | Restricted stock award activity during the year ended December 31, 2017 was as follows:
|  | Number of Shares (in thousands) |  |  | Weighted Average Grant-Date Fair Value (1) |
Non-vested at December 31, 2016 |  |  | 827 |  |  | $ | 9.14 |
Granted |  |  | 295 |  |  | $ | 14.90 |
Vested |  |  | (395 | ) |  | $ | 8.61 |
Forfeited |  |  | (3 | ) |  | $ | 8.36 |
Non-vested at December 31, 2017 |  |  | 724 |  |  | $ | 11.78 |
(1) | Represents weighted average market value of the shares as the awards are granted at no cost to the recipients.

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + 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 (h)(1) -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 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited 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=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 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=96867065&loc=d3e5070-113901 + Details
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