Stock-Based Compensation (Narrative) (Details) (USD $)	12 Months Ended
Dec. 31, 2014 ShareBasedCompensationPlan	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock incentive plans	2
Stock incentive plan, vesting period	4 years
Stock-based Compensation Expense	$ 16,502,000us-gaap_ShareBasedCompensation	$ 12,324,000us-gaap_ShareBasedCompensation	$ 11,110,000us-gaap_ShareBasedCompensation
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	93,092
Restricted Stock Units [Member]
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	$ 31.87	$ 31.72	$ 21.73
Unrecognized compensation expense	8,500,000
Weighted-average period for recognition of compensation cost	2 years 2 months 12 days
Number of shares granted	412,668
Total fair value of restricted stock vested	6,900,000	7,100,000	0
Stock-based Compensation Expense	14,600,000	8,100,000	5,500,000
Restricted Stock Awards [Member]
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		$ 26.86	$ 28.30
Unrecognized compensation expense	1,400,000
Weighted-average period for recognition of compensation cost	1 year 9 months 18 days
Total fair value of restricted stock vested	10,800,000	8,100,000	15,100,000
Stock-based Compensation Expense	1,900,000	4,100,000	5,500,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of options exercised	2,800,000	6,700,000	12,900,000
Tax benefits from options exercised	900,000	2,300,000	4,500,000
Cash received from option exercises	800,000	2,600,000	7,300,000
Stock-based Compensation Expense	$ 10,000	$ 100,000	$ 100,000
Performance Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Grant Date Fair Value, Granted	$ 38.40
Number of shares granted	206,587
2007 Stock Inventive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock authorized under the plan	9,679,393
Options granted, net of cancellation	416,500
Restricted shares granted, net of cancellations	4,516,800
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	247,625
2001 Stock Inventive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted, net of cancellation	6,438,172
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	6,177,704
Vesting Two Years From January 31 of Grant Year [Member] \| Restricted Stock Units [Member]
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 [Member] \| Restricted Stock Units [Member]
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 [Member] \| Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock incentive plan, vesting period	48 months
Vesting percentage	25.00%

Number of stock incentive plans that the Company currently has

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

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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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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 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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Percentage of vesting of share-based compensation awards.

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

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Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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

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