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Stock-Based Compensation (Text Block) | 6 Months Ended
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Jun. 30, 2017
Share-based Compensation, Allocation and Classification in Financial Statements [Abstract] |
Stock-Based Compensation [Text Block] | Stock-Based Compensation We maintain the Second Amended and Restated 2010 Stock Incentive Plan (Stock Incentive Plan), which allows us to grant equity-based compensation awards, including stock options, restricted stock units, phantom stock, and unrestricted stock units. Under the Stock Incentive Plan, we have 10,473,956 shares of common stock reserved and authorized for issuance subject to stock splits, dividends, and other similar events. At June 30, 2017, 4,647,815 shares were available for grant under the Stock Incentive Plan. We issue new shares of common stock upon the exercise of stock options or when vesting conditions on restricted stock units are fully satisfied. These shares are subject to a fungible share provision such that the authorized share reserve is reduced by (i) one share for every one share subject to a stock option or share appreciation right granted under the Plan and (ii) 1.7 shares for every one share of common stock that was subject to an award other than an option or share appreciation right. We also periodically award phantom stock units, which are settled in cash upon vesting and accounted for as liability-based awards with no impact to the shares available for grant. In addition, we maintain the Employee Stock Purchase Plan (ESPP), for which approximately 355,000 shares of common stock were available for future issuance at June 30, 2017. Unrestricted stock and ESPP activity for the three and six months ended June 30, 2017 and 2016 was not significant. Stock-Based Compensation Expense Total stock-based compensation expense and the related tax benefit were as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
| (in thousands)
Stock options | $ | 598 |  |  | $ | 585 |  |  | $ | 1,257 |  |  | $ | 1,139 |
Restricted stock units | 4,071 |  |  | 3,143 |  |  | 8,368 |  |  | 6,239 |
Unrestricted stock awards | 255 |  |  | 250 |  |  | 510 |  |  | 500 |
Phantom stock units | 492 |  |  | 211 |  |  | 884 |  |  | 287 |
Total stock-based compensation | $ | 5,416 |  |  | $ | 4,189 |  |  | $ | 11,019 |  |  | $ | 8,165 |
Related tax benefit | $ | 1,100 |  |  | $ | 1,296 |  |  | $ | 2,328 |  |  | $ | 2,504 |
Stock Options A summary of our stock option activity is as follows:
| Shares |  | Weighted Average Exercise Price per Share |  | Weighted Average Remaining Contractual Life |  | Aggregate Intrinsic Value |  | Weighted Average Grant Date Fair Value
| (in thousands) |  |  |  | (years) |  | (in thousands) |  |
Outstanding, January 1, 2016 | 1,180 |  |  | $ | 48.31 |  |  | 5.7 |  | $ | 405 |  |  |
Granted | 185 |  |  | 40.04 |  |  |  |  |  |  | $ | 13.15 |
Exercised | (34 | ) |  | 35.29 |  |  |  |  | 195 |  |  |
Forfeited | (36 | ) |  | 35.29 |  |  |  |  |  |  |
Expired | (147 | ) |  | 62.50 |  |  |  |  |  |  |
Outstanding, June 30, 2016 | 1,148 |  |  | $ | 45.95 |  |  | 6.0 |  | $ | 3,700 |  |  |
Outstanding, January 1, 2017 | 959 |  |  | $ | 45.64 |  |  | 6.6 |  | $ | 19,125 |  |  |
Granted | 132 |  |  | 65.80 |  |  |  |  |  |  | $ | 21.99 |
Exercised | (34 | ) |  | 37.58 |  |  |  |  | 933 |  |  |
Forfeited | (35 | ) |  | 47.38 |  |  |  |  |  |  |
Expired | (47 | ) |  | 67.43 |  |  |  |  |  |  |
Outstanding, June 30, 2017 | 975 |  |  | $ | 47.54 |  |  | 6.7 |  | $ | 21,680 |  |  |
Exercisable June 30, 2017 | 632 |  |  | $ | 47.38 |  |  | 5.5 |  | $ | 14,846 |  |  |
Expected to vest, June 30, 2017 | 343 |  |  | $ | 47.85 |  |  | 8.8 |  | $ | 6,834 |  |  |
At June 30, 2017, total unrecognized stock-based compensation expense related to nonvested stock options was $4.2 million, which is expected to be recognized over a weighted average period of approximately 1.8 years. The weighted-average assumptions used to estimate the fair value of stock options granted and the resulting weighted average fair value are as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Expected volatility | 30.8 | % |  | — | % |  | 32.6 | % |  | 33.5 | %
Risk-free interest rate | 1.8 | % |  | — | % |  | 2.0 | % |  | 1.3 | %
Expected term (years) | 5.5 |  |  | — |  |  | 5.5 |  |  | 5.5 |
Weighted average fair value | $ | 21.71 |  |  | $ | — |  |  | $ | 21.99 |  |  | $ | 13.15 |
Restricted Stock Units The following table summarizes restricted stock unit activity:
| Number of Restricted Stock Units |  | Weighted Average Grant Date Fair Value |  | Aggregate Intrinsic Value
| (in thousands) |  |  |  | (in thousands)
Outstanding, January 1, 2016 | 756 |  |  |  |  |
Granted | 172 |  |  | $ | 40.02 |  |  |
Released | (270 | ) |  |  |  | $ | 10,429 |
Forfeited | (42 | ) |  |  |  |
Outstanding, June 30, 2016 | 616 |  |  |  |  |
Outstanding, January 1, 2017 | 701 |  |  | $ | 38.04 |  |  |
Granted | 140 |  |  | 65.48 |  |  |
Released | (328 | ) |  | 38.26 |  |  | $ | 12,533 |
Forfeited | (19 | ) |  | 43.60 |  |  |
Outstanding, June 30, 2017 | 494 |  |  | 45.58 |  |  |
Vested but not released, June 30, 2017 | 7 |  |  |  |  | $ | 447 |
Expected to vest, June 30, 2017 | 403 |  |  |  |  | $ | 27,332 |
At June 30, 2017, total unrecognized compensation expense on restricted stock units was $30.2 million, which is expected to be recognized over a weighted average period of approximately 1.9 years. The weighted-average assumptions used to estimate the fair value of performance-based restricted stock units granted and the resulting weighted average fair value are as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Expected volatility | 28.0 | % |  | — | % |  | 28.0 | % |  | 30.0 | %
Risk-free interest rate | 1.4 | % |  | — | % |  | 1.1 | % |  | 0.7 | %
Expected term (years) | 2.5 |  |  | — |  |  | 1.7 |  |  | 1.8 |
Weighted average fair value | $ | 75.58 |  |  | $ | — |  |  | $ | 77.65 |  |  | $ | 44.77 |
Phantom Stock Units The following table summarizes phantom stock unit activity:
| Number of Phantom Stock Units |  | Weighted Average Grant Date Fair Value
| (in thousands) |  |
Outstanding, January 1, 2016 | — |  |  |
Granted | 63 |  |  | $ | 40.11 |
Forfeited | (1 | ) |  |
Outstanding, June 30, 2016 | 62 |  |  |
Expected to vest, June 30, 2016 | 55 |  |  |
Outstanding, January 1, 2017 | 62 |  |  | $ | 40.11 |
Granted | 32 |  |  | 65.55 |
Released | (20 | ) |  | 40.11 |
Forfeited | (6 | ) |  | 40.05 |
Outstanding, June 30, 2017 | 68 |  |  | 52.18 |
Expected to vest, June 30, 2017 | 68 |  |  |  |
At June 30, 2017, total unrecognized compensation expense on phantom stock units was $3.9 million, which is expected to be recognized over a weighted average period of approximately 2.0 years. As of June 30, 2017 and December 31, 2016, we have recognized a phantom stock liability of $0.7 million and $1.0 million, respectively, within wages and benefits payable in the Consolidated Balance Sheets.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666 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) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 + Details
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