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Share Data (Calculation Of Basic And Diluted Earnings Per Share) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified

3 Months Ended

12 Months Ended

Dec. 31, 2011

Sep. 30, 2011

Jun. 30, 2011

Mar. 31, 2011

Dec. 31, 2010

Sep. 30, 2010

Jun. 30, 2010

Mar. 31, 2010

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2009

Share Data [Abstract]

Income (loss) from continuing operations attributable to common shareholders

$ 22,546

$ 8,242

$ (75,201)

Amount allocated to participating securities

(551)

(265)

637

Income (loss) from continuing operations attributable to common shareholders, net of amount allocated to participating securities

21,995

7,977

(74,564)

Income from discontinued operations, including gain on sale, attributable to common shareholders

26,833

14,974

24,401

Net income (loss) attributable to common shareholders, as adjusted

48,828

22,951

(50,163)

Income (loss) from continuing operations attributable to common shareholders, as adjusted - per share

$ 0.30

$ 0.11

$ (1.19)

Income from discontinued operations, including gain on sale, attributable to common shareholders - per share

$ 0.37

$ 0.22

$ 0.39

Net income (loss) attributable to common shareholders, as adjusted - per share

$ 0.63

^[1]

$ 0.16

$ (0.23)

^[2]

$ 0.10

$ 0.24

^[3]

$ 0.02

$ 0.03

$ 0.03

$ 0.67

^[4]

$ 0.33

^[4]

$ (0.80)

Weighted average number of common shares outstanding - basic

72,756,000

68,608,000

62,359,000

Income allocated to common units

$ 45

Income (loss) from continuing operations attibutable to shareholders, as adjusted

22,040

7,977

(74,564)

Net income (loss) attributable to common shareholders, as adjusted

$ 48,873

$ 22,951

$ (50,163)

Income (loss) from continuing operations attributable to common shareholders, as adjusted - per share

$ 0.30

$ 0.11

$ (1.19)

Income from discontinued operations, including gain on sale, attributable to common shareholders - per share

$ 0.36

$ 0.22

$ 0.39

Net income (loss) attributable to common shareholders, as adjusted - per share

$ 0.62

^[1]

$ 0.16

$ (0.23)

^[2]

$ 0.10

$ 0.24

^[3]

$ 0.02

$ 0.03

$ 0.03

$ 0.66

^[4]

$ 0.33

^[4]

$ (0.80)

Common share options and share awards granted

706,000

349,000

Common units

239,000

Weighted average number of common shares outstanding - diluted

73,701,000

68,957,000

62,359,000

Number of common share equivalent securities excluded from the diluted earnings per share calculation

3,800,000

4,800,000

4,900,000

[1]	Includes a $24,621, or $0.33 basic and diluted per share, impact related to the gain on sale of discontinued operations.
[2]	Includes a $29,791 loss, or $0.41 basic and diluted per share, impact related to a loss on discontinuation of a hedging relationship.
[3]	Includes a $9,614, or $0.14 basic and $0.13 diluted per share, impact related to the gain on sale of discontinued operations.
[4]	Net income per share is computed independently for each of the quarters presented. Therefore, the sum of quarterly net income (loss) per share amounts may not equal the total computed for the year.

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