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Unsecured Exchangeable Senior Notes Unsecured Exchangeable Senior Notes (Narrative) (details) (USD $)
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3 Months Ended | 6 Months Ended | 0 Months Ended | |||||
|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Dec. 31, 2012
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May 18, 2013
3.75% xchangeable Senior Notes [Member]
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May 18, 2013
3.75% xchangeable Senior Notes [Member]
Redeemed amount [Member]
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May 18, 2013
3.75% xchangeable Senior Notes [Member]
Submitted for Exchange [Member]
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| Debt Instrument [Line Items] | ||||||||
| Coupon/Stated Rate | 3.75% | |||||||
| Redemption Date | May 18, 2013 | |||||||
| Debt Instrument Redemption Price Principal Percentage | 100.00% | |||||||
| Repayments of Unsecured Debt | $ 990,000 | $ 449,010,000 | ||||||
| Shares issued as part of the exchange | 152,463,640 | 152,463,640 | 151,680,119 | 419,116 | ||||
| Losses from early extinguishment of debt | $ (152,000) | $ (274,000) | $ (152,000) | $ (1,041,000) | $ 100,000 | |||