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Share-Based Compensation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Share-Based Compensation [Abstract] |  |  |  |
Percent of market price | 100.00% |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares available to be granted under existing stock plans (in shares) | 1,100 |  |  |
Grant Date Weighted Average Fair Value [Abstract] |  |  |  |
Total pre-tax share-based compensation recognized in the Consolidated Statements of Earnings | $ 7,700 | $ 1,600 | $ 6,300 |
Tax related benefits | 2,800 | 500 | 2,400 |
Cash received from the exercise of stock options | $ 700 | $ 400 | $ 600 |
Range of Exercise Price 1 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Exercise price range, lower range (in dollars per share) | $ 26.12 |  |  |
Exercise price range, upper range (in dollars per share) | $ 30.06 |  |  |
Options outstanding (in shares) | 6 |  |  |
Weighted average remaining contractual life, in years | 3 months 18 days |  |  |
Weighted average exercise price (in dollars per share) | $ 26.12 |  |  |
Options exercisable (in shares) | 6 |  |  |
Weighted average exercise price (in dollars per share) | $ 26.12 |  |  |
Range of Exercise Price 2 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Exercise price range, lower range (in dollars per share) | 30.07 |  |  |
Exercise price range, upper range (in dollars per share) | $ 30.07 |  |  |
Options outstanding (in shares) | 9 |  |  |
Weighted average remaining contractual life, in years | 1 year 3 months 18 days |  |  |
Weighted average exercise price (in dollars per share) | $ 30.07 |  |  |
Options exercisable (in shares) | 9 |  |  |
Weighted average exercise price (in dollars per share) | $ 30.07 |  |  |
Non-vested Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Expense recognition period | 5 years |  |  |
Aggregate Intrinsic Value [Abstract] |  |  |  |
Age participant attains for recognition of expenses from date of grant | 65 years |  |  |
Percentage of future grants that will be performance stock unit awards | 100.00% | 100.00% | 100.00% | 50.00%
Percentage of future grants that will be time vesting stock unit awards |  |  |  | 50.00%
Percentage of stated performance metrics award of grant | 150.00% | 150.00% | 150.00% | 150.00%
Number of years to measure performance metrics | 3 years | 3 years | 3 years | 2 years
Non-vested Stock [Roll Forward] |  |  |  |
Outstanding, beginning of period (in shares) | 542 | 604 | 497 |
Granted (in shares) | 119 | 154 | 171 |
Vested (in shares) | (172) | (74) | (40) |
Cancelled (in shares) | (54) | (142) | (24) |
Outstanding, end of period (in shares) | 435 | 542 | 604 | 497
Grant Date Weighted Average Fair Value [Abstract] |  |  |  |
Outstanding, beginning of period (in dollars per share) | $ 48.94 | $ 43.84 | $ 38.46 |
Granted (in dollars per share) | 69.92 | 60.65 | 55.21 |
Vested (in dollars per share) | 43.42 | 35.51 | 27.15 |
Cancelled (in dollars per share) | 52.41 | 47.02 | 40.84 |
Outstanding, end of period (in dollars per share) | $ 56.44 | $ 48.94 | $ 43.84 | $ 38.46
Outstanding, aggregate intrinsic value | $ 34,184 | $ 34,063 | $ 36,454 | $ 24,095
Total intrinsic values of shares vested | $ 12,800 | $ 4,800 | $ 2,200 |
Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grants in period (in shares) | 0 | 0 | 0 |
Expense recognition period | 3 years |  |  |
Expiration from date of grant | 10 years |  |  |
Stock Options [Roll Forward] |  |  |  |
Outstanding, beginning of period (in shares) | 45 | 66 | 93 |
Exercised (in shares) | (30) | (21) | (27) |
Outstanding, end of period (in shares) | 15 | 45 | 66 | 93
Exercisable, end of period (in shares) | 15 |  |  |
Weighted Average Exercise Price [Abstract] |  |  |  |
Outstanding, beginning of period (in dollars per share) | $ 24.84 | $ 23.49 | $ 23.04 |
Exercised (in dollars per share) | 23.11 | 20.59 | 21.92 |
Outstanding, end of period (in dollars per share) | 28.45 | $ 24.84 | $ 23.49 | $ 23.04
Exercisable, end of period (in dollars per share) | $ 28.45 |  |  |
Weighted Average Remaining Life [Abstract] |  |  |  |
Outstanding | 10 months 24 days | 1 year 2 months 12 days | 1 year 8 months 12 days | 2 years 2 months 12 days
Exercisable | 10 months 24 days |  |  |
Aggregate Intrinsic Value [Abstract] |  |  |  |
Aggregate intrinsic value, outstanding | $ 735 | $ 1,715 | $ 2,438 | $ 2,374
Aggregate intrinsic value, exercisable | 735 |  |  |
Aggregate intrinsic values of stock options exercised | 1,300 | $ 900 | $ 800 |
Non-vested Stock and Performance Stock Units [Member] |  |  |  |
Grant Date Weighted Average Fair Value [Abstract] |  |  |  |
Compensation cost net yet recognized | $ 13,600 |  |  |
Compensation cost not yet recognized, period for recognition | 1 year 6 months 4 days |  |  |

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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + 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=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Purchase price of common stock expressed as a percentage of its fair value. + References No definition available. + Details
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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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