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Noncontrolling Interests (Schedule Of Redeemable Noncontrolling Interest) (Details) (USD $)
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0 Months Ended | 3 Months Ended | 6 Months Ended | 0 Months Ended | 6 Months Ended | |||||||||||||
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Jun. 30, 2012
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Dec. 31, 2011
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Jun. 01, 2012
DaVinciRe [Member]
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Jun. 01, 2011
DaVinciRe [Member]
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Jun. 30, 2012
DaVinciRe [Member]
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Jun. 30, 2011
DaVinciRe [Member]
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Jun. 30, 2012
DaVinciRe [Member]
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Jun. 30, 2011
DaVinciRe [Member]
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Jan. 02, 2012
DaVinciRe [Member]
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Dec. 31, 2011
DaVinciRe [Member]
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Jan. 02, 2012
DaVinciRe [Member]
Retroactive Adjustment [Member]
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Jan. 02, 2012
DaVinciRe [Member]
Redeemable Noncontrolling Interest Member
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Jun. 30, 2012
DaVinciRe [Member]
Redeemable Noncontrolling Interest Member
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Jun. 01, 2012
DaVinciRe [Member]
Redeemable Noncontrolling Interest Member
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Jun. 30, 2012
DaVinciRe [Member]
Redeemable Noncontrolling Interest Member
Notice Submitted in Advance of Deadline [Member]
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Jan. 02, 2012
DaVinciRe [Member]
Redeemable Noncontrolling Interest Member
Notice Submitted in Advance of Deadline [Member]
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Dec. 31, 2011
DaVinciRe [Member]
Redeemable Noncontrolling Interest Member
Notice Submitted in Advance of Deadline [Member]
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Jun. 30, 2012
DaVinciRe [Member]
Redeemable Noncontrolling Interest Member
Maximum [Member]
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| Redeemable Noncontrolling Interest [Line Items] | ||||||||||||||||||
| Parent company ownership in redeemable noncontrolling interest | 42.80% | 31.50% | 31.50% | 34.70% | 42.80% | 31.50% | ||||||||||||
| Redemption rights, percentage of aggregate shares held, maximum | 50.00% | |||||||||||||||||
| Share repurchase requests, limit | 25.00% | |||||||||||||||||
| Redeemable Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests, Reserve Holdback | $ 5,000,000 | $ 10,000,000 | $ 2,500,000 | $ 4,900,000 | $ 1,800,000 | |||||||||||||
| Sale of shares to redeemable noncontrolling interest | 49,300,000 | 100,000,000 | 70,501,000 | 70,000,000 | 156,169,000 | 70,000,000 | ||||||||||||
| Sale of parent equity to third party | 24,700,000 | |||||||||||||||||
| Sale of third party equity to another third party | 24,700,000 | |||||||||||||||||
| Proceeds from equity raised | 49,400,000 | |||||||||||||||||
| Equity raised from parent | 30,000,000 | |||||||||||||||||
| Proceeds from sale of partial interest in consolidated subsidiary | 98,900,000 | |||||||||||||||||
| Activity in redeemable noncontrolling interest | ||||||||||||||||||
| Balance, Beginning | 900,878,000 | 657,727,000 | 796,743,000 | 536,717,000 | 657,727,000 | 757,655,000 | 50,000,000 | 9,200,000 | ||||||||||
| Net purchase of shares from redeemable noncontrolling interests | 0 | (446,000) | 0 | (135,618,000) | ||||||||||||||
| Comprehensive income: | ||||||||||||||||||
| Net income (loss) attributable to redeemable noncontrolling interest | 33,634,000 | 21,733,000 | 86,982,000 | (64,030,000) | ||||||||||||||
| Other comprehensive loss attributable to redeemable noncontrolling interest | 0 | (3,000) | 0 | (6,000) | ||||||||||||||
| Balance, Ending | $ 900,878,000 | $ 657,727,000 | $ 900,878,000 | $ 628,001,000 | $ 900,878,000 | $ 628,001,000 | $ 50,000,000 | $ 9,200,000 | ||||||||||