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Reserve of Losses and Loss Expenses (Rollforward of Reserves for Losses and Loss Expenses) (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Gross reserves for losses and loss expenses, at beginning of year $ 4,068,941,000 $ 3,144,924,000 $ 2,830,058,000
Less: reinsurance recoverable on unpaid loss and loss expenses, at beginning of year 1,409,755,000 549,490,000 [1] 313,739,000
Net reserves for losses and loss expenses, at beginning of year 2,659,186,000 2,595,434,000 2,516,319,000
Incurred losses and loss expense for claims occurring in the current year 1,147,263,000 1,146,591,000 1,113,733,000
Incurred losses and loss expenses for claims occurring in the prior years (25,525,000) (25,601,000) (38,746,000)
Total incurred losses and loss expenses 1,121,738,000 1,120,990,000 1,074,987,000
Paid losses and loss expenses for claims occurring in current year 399,559,000 424,496,000 440,786,000
Paid losses and loss expenses for claims occurring in prior years 572,434,000 632,742,000 569,944,000
Total paid losses and loss expenses 971,993,000 1,057,238,000 1,010,730,000
Acquisition of Mesa Underwriters Specialty Insurance Company (MUSIC) loss and loss expense reserves 0 0 14,858,000
Net reserves for losses and loss expenses, at end of year 2,808,931,000 2,659,186,000 2,595,434,000
Add: reinsurance recoverable on unpaid loss and loss expenses, at end of year 540,839,000 1,409,755,000 549,490,000 [1]
Gross reserves for losses and loss expenses, at end of year 3,349,770,000 4,068,941,000 3,144,924,000
Increase of net loss and loss expense reserves 149,700,000 63,800,000 79,100,000
Anticipated recoveries for salvage and subrogation claims 61,000,000 62,200,000 67,600,000
Reinsurance recoverable related to the acquisition of MUSIC     $ 44,000,000
[1] Includes $44.0 million related to the acquisition of MUSIC at December 31, 2011.