Earnings per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Reconciliation of information used in computing basic and diluted earnings per share [Abstract]
Earnings from continuing operations	$ 117,190	$ 170,041
Earnings (loss) from discontinued operations, net	92,320	(9,903)
Net earnings	$ 209,510us-gaap_NetIncomeLoss	$ 160,138us-gaap_NetIncomeLoss
Basic earnings (loss) per common share:
Earnings from continuing operations (in dollars per basic share)	$ 0.72	$ 1.00
Earnings (loss) from discontinued operations, net (in dollars per basic share)	$ 0.57	$ (0.06)
Net earnings (in dollars per basic share)	$ 1.30us-gaap_EarningsPerShareBasic	$ 0.94us-gaap_EarningsPerShareBasic
Weighted average shares outstanding - basic (in shares)	161,650,000	169,750,000
Diluted earnings (loss) per common share:
Earnings from continuing operations (in dollars per diluted share)	$ 0.72	$ 0.99
Earnings (loss) from discontinued operations, net (in dollars per diluted share)	$ 0.57	$ (0.06)
Net earnings (in dollars per diluted share)	$ 1.28us-gaap_EarningsPerShareDiluted	$ 0.93us-gaap_EarningsPerShareDiluted
Weighted average shares outstanding - diluted (in shares)	163,323,000	172,013,000
Reconciliation Of Share Amounts Used In Computing Earnings Per Share [Abstract]
Weighted average shares outstanding - basic (in shares)	161,650,000	169,750,000
Dilutive effect of assumed exercise of employee stock options, SAR's and performance shares (in shares)	1,673,000	2,263,000
Weighted average shares outstanding - diluted (in shares)	163,323,000	172,013,000
Weighted average number of anti-dilutive potential common shares excluded from reconciliation calculations (in shares)	56,000	48,000

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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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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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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