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Share Based Award (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of stock compensation and related tax benefits [Table Text Block] | The table below summarizes compensation costs and related tax benefits (in thousands):
|  | Year ended December 31,
(In thousands) |  | 2017 |  | 2016 |  | 2015
Stock compensation expense |  | $ | 19,352 |  |  | $ | 15,242 |  |  | $ | 12,827 |
Tax benefit from stock-based compensation cost |  | $ | 7,247 |  |  | $ | 5,682 |  |  | $ | 4,922 |
Indirect tax benefit |  | $ | 1,374 |  |  | $ | — |  |  | $ | 1,997 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The table below summarizes the total time-based stock options granted, total valuation and the weighted average assumptions (dollars in thousands):
|  | Year ended December 31,
|  | 2017 |  | 2016 |  | 2015
Number of time-based options granted |  | 8,825 |  |  | 13,405 |  |  | 22,816 |
Grant date fair value of options granted (in thousands) |  | $ | 375 |  |  | $ | 413 |  |  | $ | 590 |
Weighted average assumptions for stock option valuation: |  |  |  |  |  |
Expected term (years) |  | 5.5 |  |  | 5.5 |  |  | 5.6 |
Expected stock price volatility |  | 27.0 | % |  | 31.8 | % |  | 25.9 | %
Risk-free interest rate |  | 1.1 | % |  | 0.7 | % |  | 1.7 | %
Expected dividend yield |  | — | % |  | — | % |  | — | %
Weighted average grant price per option |  | $ | 158.20 |  |  | $ | 101.32 |  |  | $ | 93.30 |
Weighted average grant date fair value per option |  | $ | 42.51 |  |  | $ | 30.78 |  |  | $ | 25.86 |
Schedule of Share-based compensation, performance stock option activity [Table Text Block] | The table below summarizes the performance stock options granted, the total valuation and the weighted average assumptions (dollars in thousands). There were no performance option grants in 2017 or 2016.
|  | Year ended December 31,
|  | 2017 |  | 2016 |  | 2015
Number of performance options granted |  |  |  |  |  | 244,825 |
Number of performance options earned |  |  |  | 244,825 |  |  | 349,812 |
Grant date fair value of options granted (in thousands) |  |  |  |  |  | $ | 6,087 |
Weighted average assumptions for stock option valuation: |  |  |  |  |  |
Expected term (years) |  |  |  |  |  | 3.0 |
Expected stock price volatility |  |  |  |  |  | 30.86 | %
Risk-free interest rate |  |  |  |  |  | 2.3 | %
Expected dividend yield |  |  |  |  |  | — | %
Weighted average grant price per option |  |  |  |  |  | $ | 91.88 |
Weighted average grant date fair value per option |  |  |  |  |  | $ | 24.86 |
Share-based Compensation, Stock Options, Activity [Table Text Block] | A summary of our stock option activity as of and for the year ended December 31, 2017 is as follows:
|  | Shares |  | Weighted Average Exercise Price Per Share |  | Weighted Average Contractual Life (Years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2016 |  | 2,018,290 |  |  | $ | 58.90 |  |  |  |  |
Granted |  | 8,825 |  |  | $ | 158.20 |  |  |  |  |
Exercised |  | (610,316 | ) |  | $ | 52.43 |  |  |  |  |
Forfeited or expired |  | (72 | ) |  | $ | 58.79 |  |  |  |  |
Outstanding at December 31, 2017 |  | 1,416,727 |  |  | $ | 62.30 |  |  | 5.8 |  | $ | 217,749 |
Exercisable at December 31, 2017 |  | 1,133,734 |  |  | $ | 60.13 |  |  | 5.6 |  | $ | 176,721 |
Vested and expected to vest, December 31, 2017 |  | 1,416,727 |  |  | $ | 62.30 |  |  | 5.8 |  | $ | 217,749 |
Exercised Options Data [Table Text Block] |
|  | Year ended December 31,
(In thousands) |  | 2017 |  | 2016 |  | 2015
Intrinsic value of options exercised |  | $ | 71,283 |  |  | $ | 25,065 |  |  | $ | 28,071 |
Cash received from exercise of stock options |  | $ | 32,003 |  |  | $ | 17,346 |  |  | $ | 15,042 |
Tax benefit from stock option exercises |  | $ | 20,004 |  |  | $ | 7,556 |  |  | $ | 9,330 |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] | The table below summarizes our restricted stock award activity (dollars in thousands):
|  | Year ended December 31,
(In thousands except shares and per share amounts) |  | 2017 |  | 2016 |  | 2015
PRSU |  |  |  |  |  |
Shares granted |  | 20,686 |  |  | 36,370 |  |  | — |
Shares earned |  | — |  |  | — |  |  | — |
Grant date fair value per share |  | $ | 154.75 |  |  | $ | 86.47 |  |  | $ | — |
Grant date fair value |  | $ | 3,201 |  |  | $ | 3,145 |  |  | $ | — |
Intrinsic value vested |  | $ | — |  |  | $ | — |  |  | $ | 787 |
RSU |  |  |  |  |  |
Shares granted |  | 107,678 |  |  | 60,377 |  |  | 67,745 |
Grant date fair value per share |  | $ | 156.49 |  |  | $ | 87.47 |  |  | $ | 93.52 |
Grant date fair value |  | $ | 16,851 |  |  | $ | 5,281 |  |  | $ | 6,336 |
Intrinsic value vested |  | $ | 9,813 |  |  | $ | 4,680 |  |  | $ | 2,754 |
Nonvested Restricted Stock Shares Activity [Table Text Block] | The table below provides a summary of our PRSU and RSU activity as of and for the year ended December 31, 2017.
|  | Number of Units |  | Grant Date Fair Value Per Share |  | Weighted Average Contractual Life (Years) |  | Aggregate Intrinsic Value
Non-vested at December 31, 2016 |  | 159,439 |  |  | $ | 84.68 |  |  |  |  |
Change in units due to performance expectations (a) |  | 72,740 |  |  | $ | 86.47 |  |  |  |  |
Granted |  | 128,364 |  |  | $ | 156.21 |  |  |  |  |
Vested |  | (66,278 | ) |  | $ | 80.61 |  |  |  |  |
Forfeited |  | (8,762 | ) |  | $ | 148.76 |  |  |  |  |
Non-vested and expected to vest at December 31, 2017 |  | 285,503 |  |  | $ | 116.28 |  |  | 1.0 |  | $ | 33,197 |
Schedule of employee stock purchase plan (ESPP) [Table Text Block] | The table below summarizes the number and intrinsic value of ESPP share purchases and the weighted average valuation assumptions for the 2017, 2016 and 2015 purchase periods.
|  | Year ended December 31,
|  | 2017 |  | 2016 |  | 2015
ESPP shares purchased by employees |  | 23,426 |  |  | 31,227 |  |  | 34,299 |
Intrinsic value of ESPP purchases (in thousands) |  | $ | 986 |  |  | $ | 955 |  |  | $ | 1,382 |
Weighted average assumptions for ESPP valuation: |  |  |  |  |  |
Expected term (in years) |  | 0.5 |  |  | 0.5 |  |  | 0.5 |
Expected stock price volatility |  | 28.1 | % |  | 32.5 | % |  | 27.0 | %
Risk-free interest rate |  | 0.6 | % |  | 0.3 | % |  | 0.6 | %
Expected dividend yield |  | — | % |  | — | % |  | — | %

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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 employee stock purchase plans, including, but not limited to: (a) expected term, (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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- 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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