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Earnings Per Share (Reconciliation of the Numerators and Denominators of the Basic and Diluted Per Shares) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]
Net income (numerator for basic and diluted calculations)	$ 125,114us-gaap_NetIncomeLoss	$ 136,664us-gaap_NetIncomeLoss
Shares:
Weighted average outstanding shares (denominator for basic calculation)	68,141us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	70,574us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Equivalent shares from outstanding stock options	801us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	690us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Denominator for diluted calculation	68,942us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	71,264us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings Per Share:
Basic earnings per share	$ 1.84us-gaap_EarningsPerShareBasic	$ 1.94us-gaap_EarningsPerShareBasic
Diluted earnings per share	$ 1.81us-gaap_EarningsPerShareDiluted	$ 1.92us-gaap_EarningsPerShareDiluted

X

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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