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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2018
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:
| Three Months Ended March 31,
| 2018 |  | 2017
| (in thousands)
Stock options | $ | 831 |  |  | $ | 659 |
Restricted stock units | 7,057 |  |  | 4,297 |
Unrestricted stock awards | 207 |  |  | 255 |
Phantom stock units | 690 |  |  | 392 |
Total stock-based compensation | $ | 8,785 |  |  | $ | 5,603 |
Related tax benefit | $ | 1,534 |  |  | $ | 1,228 |
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, 2017 | 959 |  |  | $ | 45.64 |  |  | 6.6 |  | $ | 19,125 |  |  |
Granted | 121 |  |  | 65.55 |  |  |  |  |  |  | $ | 22.01 |
Exercised | (5 | ) |  | 35.29 |  |  |  |  | 120 |  |  |
Outstanding, March 31, 2017 | 1,075 |  |  | $ | 47.92 |  |  | 6.7 |  | $ | 17,236 |  |  |
Outstanding, January 1, 2018 | 956 |  |  | $ | 47.10 |  |  | 6.3 |  | $ | 21,965 |  |  |
Converted upon acquisition | 42 |  |  | 51.86 |  |  |  |  |  |  | $ | 14.86 |
Granted | 101 |  |  | 69.30 |  |  |  |  |  |  | $ | 24.83 |
Exercised | (62 | ) |  | 40.31 |  |  |  |  | 2,104 |  |  |
Forfeited | (3 | ) |  | 72.25 |  |  |  |  |  |  |
Expired | (7 | ) |  | 95.96 |  |  |  |  |  |  |
Outstanding, March 31, 2018 | 1,027 |  |  | $ | 49.49 |  |  | 6.5 |  | $ | 24,051 |  |  |
Exercisable March 31, 2018 | 716 |  |  | $ | 45.96 |  |  | 5.5 |  | $ | 19,725 |  |  |
Expected to vest, March 31, 2018 | 308 |  |  | $ | 57.74 |  |  | 8.9 |  | $ | 4,255 |  |  |
Stock Options, Valuation Assumptions [Table Text Block] | 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 March 31,
| 2018 |  | 2017
Expected volatility | 30.9 | % |  | 32.7 | %
Risk-free interest rate | 2.8 | % |  | 2.0 | %
Expected term (years) | 6.1 |  |  | 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, 2017 | 701 |  |  |  |  |
Granted | 131 |  |  | $ | 63.12 |  |  |
Released | (317 | ) |  |  |  | $ | 12,066 |
Forfeited | (3 | ) |  |  |  |
Outstanding, March 31, 2017 | 512 |  |  |  |  |
Outstanding, January 1, 2018 | 556 |  |  | $ | 47.68 |  |  |
Converted upon acquisition | 579 |  |  | 69.40 |  |  |
Granted | 136 |  |  | 69.30 |  |  |
Released | (352 | ) |  | 47.18 |  |  | $ | 17,231 |
Forfeited | (28 | ) |  | 68.44 |  |  |
Outstanding, March 31, 2018 | 891 |  |  | 63.72 |  |  |
Vested but not released, March 31, 2018 | 10 |  |  |  |  | $ | 729 |
Expected to vest, March 31, 2018 | 788 |  |  |  |  | $ | 56,369 |
Restricted Stock Units, Valuation Assumptions | 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 March 31,
| 2018 |  | 2017
Expected volatility | 28.0 | % |  | 28.0 | %
Risk-free interest rate | 2.2 | % |  | 1.0 | %
Expected term (years) | 2.1 |  |  | 1.7 |
Weighted average fair value | $ | 78.56 |  |  | $ | 77.78 |
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, 2017 | 62 |  |  |  |
Granted | 32 |  |  | $ | 65.55 |
Released | (19 | ) |  |  |
Forfeited | (2 | ) |  |  |
Outstanding, March 31, 2017 | 73 |  |  |  |
Expected to vest, March 31, 2017 | 73 |  |  |
Outstanding, January 1, 2018 | 63 |  |  | $ | 51.88 |
Converted upon acquisition | 21 |  |  | 69.40 |
Granted | 31 |  |  | 69.30 |
Released | (27 | ) |  | 50.19 |
Forfeited | (1 | ) |  | 69.36 |
Outstanding, March 31, 2018 | 87 |  |  | 62.61 |
Expected to vest, March 31, 2018 | 85 |  |  |  |

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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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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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 + Details
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- Definition Tabular disclosure of the changes in other outstanding share-based compensation awards other than stock options or nonvested awards. + 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 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 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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