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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Share-based Compensation [Abstract] |
Stock-Based Compensation Expense and Related Tax Benefit [Table Text Block] | Total stock-based compensation expense and the related tax benefit were as follows:
| 2017 |  | 2016 |  | 2015
| (in thousands)
Stock options | $ | 2,695 |  |  | $ | 2,357 |  |  | $ | 2,648 |
Restricted stock units | 17,738 |  |  | 14,723 |  |  | 10,735 |
Unrestricted stock awards | 974 |  |  | 955 |  |  | 706 |
Phantom stock units | 1,747 |  |  | 1,077 |  |  | — |
Total stock-based compensation | $ | 23,154 |  |  | $ | 19,112 |  |  | $ | 14,089 |
Related tax benefit | $ | 5,034 |  |  | $ | 4,927 |  |  | $ | 4,228 |
Employee Stock Options Activity [Table Text Block] | 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, 2015 | 1,123 |  |  | $ | 51.90 |  |  | 4.4 |  | $ | 1,676 |  |  |
Granted | 291 |  |  | 35.25 |  |  |  |  |  |  | $ | 12.09 |
Exercised | (24 | ) |  | 36.05 |  |  |  |  | 26 |  |  |
Forfeited | (17 | ) |  | 37.47 |  |  |  |  |  |  |
Expired | (193 | ) |  | 52.17 |  |  |  |  |  |  |
Outstanding, December 31, 2015 | 1,180 |  |  | $ | 48.31 |  |  | 5.7 |  | $ | 405 |  |  |
Granted | 191 |  |  | $ | 40.40 |  |  |  |  |  |  | $ | 13.27 |
Exercised | (58 | ) |  | 37.00 |  |  |  |  | $ | 742 |  |  |
Forfeited | (36 | ) |  | 35.29 |  |  |  |  |  |  |
Expired | (318 | ) |  | 55.13 |  |  |  |  |  |  |
Outstanding, December 31, 2016 | 959 |  |  | $ | 45.64 |  |  | 6.6 |  | $ | 19,125 |  |  |
Granted | 135 |  |  | $ | 65.94 |  |  |  |  |  |  | $ | 21.99 |
Exercised | (41 | ) |  | 39.92 |  |  |  |  | $ | 1,071 |  |  |
Forfeited | (35 | ) |  | 47.38 |  |  |  |  |  |  |
Expired | (62 | ) |  | 70.12 |  |  |  |  |  |  |
Outstanding, December 31, 2017 | 956 |  |  | $ | 47.10 |  |  | 6.3 |  | $ | 21,965 |  |  |
Exercisable, December 31, 2017 | 640 |  |  | $ | 46.08 |  |  | 5.3 |  | $ | 15,934 |  |  |
Expected to vest, December 31, 2017 | 316 |  |  | $ | 49.17 |  |  | 8.4 |  | $ | 6,031 |  |  |
Stock Options, Valuation Assumptions [Table Text Block] | s The weighted-average assumptions used to estimate the fair value of stock options granted and the resulting weighted average fair value are as follows:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Expected volatility | 32.5 | % |  | 33.5 | % |  | 34.3 | %
Risk-free interest rate | 2.0 | % |  | 1.3 | % |  | 1.7 | %
Expected term (years) | 5.5 |  |  | 5.5 |  |  | 5.5 |
Restricted Stock Units Award Activity [Table Text Block] | 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, 2015 | 682 |  |  |  |  |
Granted | 434 |  |  | $ | 35.09 |  |  |
Released | (296 | ) |  |  |  | $ | 12,204 |
Forfeited | (64 | ) |  |  |  |
Outstanding, December 31, 2015 | 756 |  |  |  |  |
Granted | 306 |  |  | $ | 41.58 |  |  |
Released | (312 | ) |  |  |  | $ | 11,944 |
Forfeited | (49 | ) |  |  |  |
Outstanding, December 31, 2016 | 701 |  |  | $ | 38.04 |  |  |
Granted | 273 |  |  | $ | 50.95 |  |  |
Released | (372 | ) |  | 36.93 |  |  | $ | 14,219 |
Forfeited | (46 | ) |  | 48.56 |  |  |
Outstanding, December 31, 2017 | 556 |  |  | $ | 47.68 |  |  |
Vested but not released, December 31, 2017 | 142 |  |  |  |  | $ | 9,650 |
Expected to vest, December 31, 2017 | 350 |  |  |  |  | $ | 23,877 |
Restricted Stock Units, Valuation Assumptions [Table Text Block] | 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:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Expected volatility | 28.0 | % |  | 30.0 | % |  | 30.1 | %
Risk-free interest rate | 1.0 | % |  | 0.7 | % |  | 0.7 | %
Expected term (years) | 1.7 |  |  | 1.8 |  |  | 2.1 |
Weighted average grant date fair value | $ | 77.75 |  |  | $ | 44.92 |  |  | $ | 33.48 |
Schedule of Other Share-based Compensation, Activity [Table Text Block] | 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, December 31, 2016 | 62 |  |  |
Expected to vest, December 31, 2016 | 57 |  |  |
Outstanding, January 1, 2017 | 62 |  |  | $ | 40.11 |
Granted | 32 |  |  | 65.55 |
Released | (20 | ) |  | 47.02 |
Forfeited | (11 | ) |  | 40.11 |
Outstanding, December 31, 2017 | 63 |  |  | $ | 47.28 |
Expected to vest, December 31, 2017 | 63 |  |  |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of restricted stock units, including, but not limited to: (a) expected term of stock units, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References No definition available. + Details
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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: 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=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 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 + Details
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