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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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 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 at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

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

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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The weighted average period between the balance sheet date and expiration for all awards outstanding under the plan, which may be expressed in a decimal value for number of years.

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

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Equity (Details 3) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
Equity (Details 3) (USD $)	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Summary of restricted stock
Compensation expense related to long-term compensation plans, restricted stock and stock options capitalized to assets	$ 900,000	$ 600,000	$ 1,900,000	$ 1,200,000
Stock options
Stock based compensation
Options expiration period (in years)			ten years
Options vesting period, minimum (in years)			one year
Options vesting period, maximum (in years)			five years
Period of commencement of option vesting, from date of grant (in years)	1		1
Weighted average assumptions used for estimation of fair value of each stock option
Dividend yield (as a percent)			2.00%		2.00%
Expected life of option (in years)			5.2		5.1
Risk-free interest rate (as a percent)			2.16%		2.09%
Expected stock price volatility (as a percent)			40.61%		50.07%
Options Outstanding
Balance at beginning of year (in shares)			1,353,002	1,324,221	1,324,221
Granted (in shares)			62,000		180,250
Exercised (in shares)			(157,548)		(109,636)
Lapsed or cancelled (in shares)			(24,967)		(41,833)
Balance at end of period (in shares)	1,232,487		1,232,487		1,353,002
Options exercisable at end of period (in shares)	739,282		739,282		631,224
Weighted average fair value of awards granted during the year			1,376,165		4,333,281
Weighted Average Exercise Price
Balance at beginning of year (in dollars per share)			$ 58.85	$ 56.74	$ 56.74
Granted (in dollars per share)	$ 68.64		$ 68.64		$ 62.00
Exercised (in dollars per share)	$ 43.96		$ 43.96		$ 31.49
Lapsed or cancelled (in dollars per share)			$ 55.58		$ 77.33
Balance at end of period (in dollars per share)	$ 61.31		$ 61.31		$ 58.85
Options exercisable at end of period (in dollars per share)	$ 68.35		$ 68.35		$ 69.42
Exercise price of options granted, low end of the range (in dollars per share)			$ 20.67
Exercise price of options granted, high end of the range (in dollars per share)			$ 137.18
Remaining weighted average contractual life of the options outstanding (in years)	4.16		4.16
Remaining weighted average contractual life of the options exercisable (in years)			4.2
Compensation expense	1,000,000	1,000,000	2,600,000	2,300,000
Total unrecognized compensation cost related to unvested stock awards	7,600,000		7,600,000
Weighted average period for recognition of compensation cost related to unvested stock awards (in years)			3
Restricted Stock Awards
Options Outstanding
Weighted average fair value of awards granted during the year			19,904,227		28,269,983
Weighted Average Exercise Price
Compensation expense			9,680,057		15,327,206
Total unrecognized compensation cost related to unvested stock awards	16,900,000		16,900,000
Weighted average period for recognition of compensation cost related to unvested stock awards (in years)			2.3
Annual award vesting rate, low end of range (as a percent)			15.00%
Annual award vesting rate, high end of range (as a percent)			35.00%
Summary of restricted stock
Balance at beginning of year (in shares)			2,728,290	2,330,532	2,330,532
Granted (in shares)			156,467		400,925
Cancelled (in shares)			(500)		(3,167)
Balance at end of period (in shares)	2,884,257		2,884,257		2,728,290
Vested during the period (in shares)			21,983		153,644
Fair value of restricted stock vested during the period			$ 1,300,000