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Employee Share Plans (Tables) | 6 Months Ended
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Jun. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Schedule of Share-Based Compensation Awards | Compensation expense for stock-based awards recognized during the three and six months ended June 30, 2018 and 2017 was as follows (in thousands):
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Stock options |  | $ | 1,030 |  |  | $ | 524 |  |  | $ | 1,548 |  |  | $ | 1,050 |
Restricted stock awards |  |  | 1,383 |  |  |  | 891 |  |  |  | 2,302 |  |  |  | 1,740 |
Total stock-based compensation expense |  | $ | 2,413 |  |  | $ | 1,415 |  |  | $ | 3,850 |  |  | $ | 2,790 |
Stock Award Activity | Stock award activity during the six months ended June 30, 2018 was as follows (in thousands, except per share data):
|  | Stock Options |  |  | Restricted Stock Awards |
|  | Number of Options |  |  | Weighted Average Exercise Price Per Share |  |  | Number of Shares |  |  | Weighted Average Grant-Date Fair Value (1) |
Outstanding at beginning of year |  |  | 3,844 |  |  | $ | 9.67 |  |  |  | 724 |  |  | $ | 11.78 |
Granted |  |  | 642 |  |  | $ | 19.45 |  |  |  | 272 |  |  | $ | 18.77 |
Exercised or released |  |  | (616 | ) |  | $ | 7.19 |  |  |  | (362 | ) |  | $ | 11.19 |
Expired or canceled |  |  | — |  |  | $ | — |  |  |  | — |  |  | $ | — |
Outstanding at June 30, 2018 |  |  | 3,870 |  |  | $ | 11.69 |  |  |  | 634 |  |  | $ | 15.33 |
Exercisable at June 30, 2018 |  |  | 2,254 |  |  | $ | 9.03 |  |  |  |  |  |  |  |  |
| (1) | Represents weighted average market value of the shares; awards are granted at no cost to the recipients.
Schedule of Fair Value Option Award Weighted Average Assumptions Used | We utilized the Black-Scholes-Merton options-pricing model to determine the fair value of stock options on the date of grant. The fair value of stock options granted during the second quarter of 2018 was $4.73. The following weighted average assumptions were utilized:
|  | Six Months Ended June 30, |
Expected volatility (1) |  |  | 22.04 | %
Expected option life (years) (2) |  |  | 4.62 |
Risk-free interest rate (3) |  |  | 2.80 | %
Expected dividend yield (4) |  |  | 0.00 | %
| (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 for the option to vest.
| (3) | The risk-free interest rate assumption was based 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.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure for share-based compensation 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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