Incentive Plans (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation [Abstract]
Number of common shares available for grant under the incentive plan (in shares)	1,299,470
Number of shares of stock authorized for issuance under the Nonqualified Plan (in shares)	3,600,000
Stock option activity [Roll Forward]
Outstanding, beginning balance (in shares)	61,000
Granted (in shares)	0
Exercised (in shares)	(18,000)
Canceled (in shares)	0
Outstanding, ending balance (in shares)	43,000	61,000
Exercisable, ending balance (in shares)	43,000
Weighted average exercise price [Abstract]
Outstanding, beginning balance (in dollars per share)	$ 24.24
Granted (in dollars per share)	$ 0.00
Exercised (in dollars per share)	$ 15.28
Canceled (in dollars per share)	$ 0.00
Outstanding, ending balance (in dollars per share)	$ 28.04	$ 24.24
Exercisable, ending balance (in dollars per share)	$ 28.04
Weighted average remaining contractual life, stock option awards outstanding at end of year (in years)	5 years 3 months
Weighted average remaining contractual life, stock option awards exercisable at end of year (in years)	5 years 3 months
Aggregate intrinsic value of options outstanding, ending balance	$ 253,000
Aggregate intrinsic value of options exercisable ending balance	253,000
Intrinsic value of options exercised during the year	300,000	1,500,000	2,500,000
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	11,053,000us-gaap_ShareBasedCompensation	11,103,000us-gaap_ShareBasedCompensation	9,814,000us-gaap_ShareBasedCompensation
Tax benefits (expense) associated with stock-based compensation	4,600,000	4,500,000	4,000,000
Fair value of shares vested during the year	10,800,000	12,300,000	11,700,000
Weighted average grant date fair value of restricted stock awards during the year (in dollars per share)	$ 28.22	$ 29.25	$ 30.47
Unrecognized compensation expense associated with the unvested shares outstanding	$ 12,700,000
Unrecognized compensation expense, period for recognition (in months)	21 months
Restricted Stock [Roll Forward]
Outstanding beginning balance (in shares)	740,000
Grants (in shares)	410,000
Vests (in shares)	(382,000)
Canceled (in shares)	(28,000)
Outstanding ending balance (in shares)	740,000	740,000
Weighted-average market value [Abstract]
Non-vested, beginning balance (in dollars per share)	$ 29.66
Granted (in dollars per share)	$ 28.22	$ 29.25	$ 30.47
Vested (in dollars per share)	$ 29.79
Canceled/forfeited (in dollars per share)	$ 28.45
Non-vested, ending balance (in dollars per share)	$ 28.84	$ 29.66
Employee Stock Purchase Plan (ESPP) [Abstract]
ESPP Stock Issued During Period (in shares)	37,000	34,000	37,000
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards vesting period	3 years
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards vesting period	5 years

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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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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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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 equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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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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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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.

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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.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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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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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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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.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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