Number of stock incentive plans that the Company currently has

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The number of options exercised from plan inception to the balance sheet date.

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No definition available.

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The number of options granted from plan inception to the balance sheet date.

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The number of awards other than options granted from plan inception to the balance sheet date.

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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.

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-Name Accounting Standards Codification
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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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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 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.

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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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The number of grants made 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).

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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).

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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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.

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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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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

Net number of share options (or share units) granted during the period.

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- Definition

Percentage of vesting of share-based compensation awards.

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Number of share options (or share units) exercised during the current period.

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Share-Based Compensation - Plans (Details) $ / shares in Units, $ in Thousands			12 Months Ended
	Dec. 31, 2016 USD ($) item shares	Jan. 01, 2011 shares	Dec. 31, 2016 USD ($) $ / shares item shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock incentive plans \| item	2		2
Stock incentive plan, vesting period			4 years
Options granted, net of cancellation \| shares	0	0
Shares purchased for options exercised \| shares			64,451,000
Intrinsic value of options exercised			$ 2,100	$ 2,700	$ 2,800
Tax benefits from options exercised			700	900	900
Cash received from option exercises			700	1,100	800
Share-based compensation			$ 21,430	$ 19,454	$ 16,502
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock incentive plan, vesting period			4 years
Weighted Average Grant Date Fair Value, Granted \| $ / shares			$ 37.63	$ 38.35	$ 31.87
Unrecognized compensation expense	$ 12,400		$ 12,400
Weighted-average period for recognition of compensation cost			2 years 2 months 12 days
Total fair value of restricted stock vested			$ 16,100	$ 9,700	$ 6,900
Share-based compensation			$ 21,000	$ 18,600	$ 14,600
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock incentive plan, vesting period			4 years
Unrecognized compensation expense	0		$ 0
Number of shares granted \| shares			0	0	0
Total fair value of restricted stock vested			$ 1,100	$ 1,200	$ 10,800
Share-based compensation			400	900	1,900
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 0		0
Share-based compensation			$ 0	$ 0	$ 10
Stock Incentive Plan 2007 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares authorized under the plan \| shares	9,679,393		9,679,393
Options granted to date \| shares	416,500		416,500
Non-option awards to date \| shares	5,682,343		5,682,343
Exercised to date \| shares	288,425		288,425
Stock Incentive Plan 2001 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted to date \| shares	6,438,172		6,438,172
Exercised to date \| shares	6,306,821		6,306,821
Options granted, net of cancellation \| shares			0	0	0
Vesting Two Years From January 31 of Grant Year \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock incentive plan, vesting period			24 months
Vesting percentage			50.00%
Vesting Three Years From January 31 of Grant Year \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock incentive plan, vesting period			36 months
Vesting percentage			25.00%
Vesting Four Years From January 31 of Grant Year \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock incentive plan, vesting period			48 months
Vesting percentage			25.00%