Employee Stock Ownership Plan, Discount Percentage

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- Definition

Incentive Compensation Plan Expense

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- Definition

Purchase of Stock, Average Price Per Share

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- Definition

Reduction In Per Share Exercise Price

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- Definition

Share Based Compensatio Settled In Cash

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Percentage Increase In Outstanding Shares

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No definition available.

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award, Expiration Year

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No definition available.

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award, Options, Exercisable Percentage

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No definition available.

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- Definition

The number of years under the plan the share based awards can be outstanding before expiration.

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award Percentage Increase in Outstanding Shares

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award Stock Purchase Rights Grants in Period Weighted Average Grant Date Fair Value

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No definition available.

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- Definition

Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 20
-Section 55
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11283-113907

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ 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 (j)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
-Paragraph 14
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Glossary Financing Activities
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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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- Definition

For each plan, identification of the award pricing model or other valuation method used in calculating the weighted average fair values disclosed. The model is also used to calculate the compensation expense that is shown within the balance sheet, income statement, and cash flow. Examples of valuation techniques are lattice models (binomial model), closed-form models (Black-Scholes-Merton formula), and a Monte Carlo simulation technique. Fair value is the amount at which an asset or liability could be bought or incurred or sold or settled in a current transaction between willing parties, that is, other than in a forced or liquidation sale. May include disclosures about the assumptions underlying application of the method selected.

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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.

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- Definition

The highest percentage of annual salary that an employee is permitted to utilize with respect to the 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
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Description of the method used for calculating compensation cost for the award under the plan.

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.

+ References

No definition available.

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- Definition

An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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- Definition

The number of shares purchased on the open market during the period for issuance to employees under the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 2: 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

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- Definition

Description of pertinent provisions of equity-based compensation awards that have actual or potential impact upon the company's financial statements.

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- Definition

Percentage of vesting of share-based compensation awards.

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Purchase price of common stock expressed as a percentage of its fair value.

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Incentive Plans (Narrative) (Details) - USD ($)	12 Months Ended
Incentive Plans (Narrative) (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Aug. 30, 2013	Feb. 28, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unvested share-based compensation arrangements, compensation costs to be expensed	$ 55,540,000
Unvested share-based compensation arrangements, number of years compensation costs to be expensed	2 years
Proceeds from exercise of stock options and employee stock purchase plans		$ 210,000	$ 3,409,000
Income tax benefits realized for the tax deductions from option exercises	$ 36,000	5,364,000	7,435,000
Vesting scheme	Under these plans, one-half of each grant is generally exercisable after two years and the remainder after three years.
Total intrinsic value of options exercised	$ 221,000	12,003,000	25,284,000
Reduction in stock option exercise price					$ 2.50
Income statement effect of reduced exercise price			6,454,000
Percentage increase in number of outstanding stock options				10.70%
Percentage decrease in exercise price of stock options				10.70%
Percentage increase in number of outstanding stock units				10.70%
Incentive compensation plan expense	$ 26,393,000	$ 38,000,000	$ 53,250,000
Share-based Compensation Award, Tranche One [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	2 years
Share-based Compensation Award, Tranche Two [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	3 years
Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Option term	7 years
2012 Long-Term Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Long term plan expiration year	2022
Maximum number of shares available for issuance	8,700,000
Maximum number of shares available for issuance, annual rate	1.00%
Number of shares available	4,673,000
2012 Long-Term Plan and the 2007 Long-Term Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Option granted to date, term of years	7 years
2012 Long-Term Plan and the 2007 Long-Term Plan [Member] \| Share-based Compensation Award, Tranche One [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage	50.00%
Employee Stock Purchase Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Salary that can be withheld by eligible employee for stock purchase	10.00%
Stock purchase price, percentage of the fair value of the stock	90.00%
Employee Stock purchase plan, termination date	The ESPP will terminate on the earlier of the date that employees have purchased all 980,000 authorized shares or June 30, 2017.
Employee stock purchases, shares	8,387	6,739	16,020
Employee stock purchases, price per share	$ 34.93	$ 56.22	$ 54.14
Number of shares available	271,815
Compensation costs estimation	Compensation costs related to the ESPP are estimated based on the value of the 10% discount and the fair value of the option that provides for the refund of participant withholdings
Discount percentage	10.00%
Compensation expenses	$ 29,000	$ 55,000	$ 143,000
Fair value per share issued under ESPP	$ 5.74	$ 6.49	$ 6.72
Employee Stock Purchase Plan [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum number of shares available for issuance	980,000
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Proceeds from exercise of stock options and employee stock purchase plans			$ 2,395,000
Stock-based compensation, fair value assumption model	Black-Scholes option pricing model
Granted stock options, valuation per option		12.84
Stock Options [Member] \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	2 years
Granted stock options, valuation per option	$ 10.97		$ 15.81
Stock Options [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	3 years
Granted stock options, valuation per option	$ 11.08		20.62
Time-Lapse Restricted Stock and Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted restricted stock, fair value	$ 49.67
Time-Lapse Restricted Stock and Restricted Stock Units [Member] \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted restricted stock, fair value		55.20	60.30
Time-Lapse Restricted Stock and Restricted Stock Units [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted restricted stock, fair value		60.85	69.67
Performance Based Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	3 years
Stock-based compensation, fair value assumption model	Monte Carlo valuation model
Performance Based Restricted Stock [Member] \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted restricted stock, fair value	$ 44.03	33.90	39.50
Performance Based Restricted Stock [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted restricted stock, fair value	$ 48.12	$ 51.30	$ 68.01
Performance Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based compensation settled in cash	$ 1,594,000	$ 9,667,000	$ 9,436,000