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Incentive Plans (Additional Information about Stock Options Outstanding) (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options Outstanding, No. of Options | 3,994,595
Options Outstanding, Avg. Life Remaining in Years | 2 years 4 months 24 days
Options Outstanding, Aggregate Intrinsic Value | $ | $ 3,719,263
Options Exercisable, No. of Options | 3,182,345
Options Exercisable, Avg. Life Remaining in Years | 1 year 9 months 18 days
Options Exercisable, Aggregate Intrinsic Value | $ | $ 1,859,631
Range of Exercise Prices per Option, $17.00 to $30.00 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Range of exercise prices per option, lower limit | $ / shares | $ 17.00
Range of exercise prices per option, upper limit | $ / shares | $ 30.00
Options Outstanding, No. of Options | 1,131,500
Options Outstanding, Avg. Life Remaining in Years | 4 years 6 months
Options Outstanding, Aggregate Intrinsic Value | $ | $ 3,719,263
Options Exercisable, No. of Options | 319,250
Options Exercisable, Avg. Life Remaining in Years | 4 years
Options Exercisable, Aggregate Intrinsic Value | $ | $ 1,859,631
Range of Exercise Prices per Option, $31.00 to $50.00 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Range of exercise prices per option, lower limit | $ / shares | $ 31.00
Range of exercise prices per option, upper limit | $ / shares | $ 50.00
Options Outstanding, No. of Options | 817,350
Options Outstanding, Avg. Life Remaining in Years | 2 years 10 months 24 days
Options Exercisable, No. of Options | 817,350
Options Exercisable, Avg. Life Remaining in Years | 2 years 10 months 24 days
Range of Exercise Prices per Option, $51.00 to $65.00 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Range of exercise prices per option, lower limit | $ / shares | $ 51.00
Range of exercise prices per option, upper limit | $ / shares | $ 65.00
Options Outstanding, No. of Options | 2,045,745
Options Outstanding, Avg. Life Remaining in Years | 1 year
Options Exercisable, No. of Options | 2,045,745
Options Exercisable, Avg. Life Remaining in Years | 1 year

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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=96867065&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options 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 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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=96867065&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=96867065&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=96867065&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=96867065&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=96867065&loc=d3e5070-113901 + Details
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