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Derivatives - Schedule of gross and net amounts of derivative instruments that are subject to enforceable master netting arrangements or similar agreements (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Gross Amounts not offset in the condensed consolidated balance sheet    
Gross Amounts of Assets Presented in the condensed consolidated balance sheet $ 37,260 $ 39,045
Financial Instruments 7,926 7,917
Cash Collateral Received 4,039 12,094
Net Amount 25,295 19,034
Gross Amounts not offset in the condensed consolidated balance sheet    
Gross Amounts of Liabilities Presented in the condensed consolidated balance sheet (excludes catastrophe risk derivatives) 12,113  
Gross Amounts of Liabilities Presented in the condensed consolidated balance sheet 12,346 8,819
Financial Instruments 7,926 7,917
Cash Collateral Pledged 4,187 902
Net Amount 0 0
Counterparty 1
   
Gross Amounts not offset in the condensed consolidated balance sheet    
Gross Amounts of Assets Presented in the condensed consolidated balance sheet 493 1,128
Financial Instruments 493 1,041
Cash Collateral Received 0 0
Net Amount 0 87
Gross Amounts not offset in the condensed consolidated balance sheet    
Gross Amounts of Liabilities Presented in the condensed consolidated balance sheet 1,149 1,041
Financial Instruments 493 1,041
Cash Collateral Pledged 656 0
Net Amount 0 0
Counterparty 2
   
Gross Amounts not offset in the condensed consolidated balance sheet    
Gross Amounts of Assets Presented in the condensed consolidated balance sheet 1,262 4,998
Financial Instruments 1,262 400
Cash Collateral Received 0 1,629
Net Amount 0 2,969
Gross Amounts not offset in the condensed consolidated balance sheet    
Gross Amounts of Liabilities Presented in the condensed consolidated balance sheet 3,788 400
Financial Instruments 1,262 400
Cash Collateral Pledged 2,526 0
Net Amount 0 0
Counterparty 3
   
Gross Amounts not offset in the condensed consolidated balance sheet    
Gross Amounts of Assets Presented in the condensed consolidated balance sheet 16,935 16,066
Financial Instruments 3,135 3,509
Cash Collateral Received 0 0
Net Amount 13,800 12,557
Gross Amounts not offset in the condensed consolidated balance sheet    
Gross Amounts of Liabilities Presented in the condensed consolidated balance sheet 3,135 3,509
Financial Instruments 3,135 3,509
Cash Collateral Pledged 0 0
Net Amount 0 0
Counterparty 4
   
Gross Amounts not offset in the condensed consolidated balance sheet    
Gross Amounts of Assets Presented in the condensed consolidated balance sheet 857 1,351
Financial Instruments 857 1,351
Cash Collateral Received 0 0
Net Amount 0 0
Gross Amounts not offset in the condensed consolidated balance sheet    
Gross Amounts of Liabilities Presented in the condensed consolidated balance sheet 1,132 1,360
Financial Instruments 857 1,351
Cash Collateral Pledged 275 9
Net Amount 0 0
Counterparty 5
   
Gross Amounts not offset in the condensed consolidated balance sheet    
Gross Amounts of Assets Presented in the condensed consolidated balance sheet 4,078 3,198
Financial Instruments 630 1,054
Cash Collateral Received 0 0
Net Amount 3,448 2,144
Gross Amounts not offset in the condensed consolidated balance sheet    
Gross Amounts of Liabilities Presented in the condensed consolidated balance sheet 630 1,054
Financial Instruments 630 1,054
Cash Collateral Pledged 0 0
Net Amount 0 0
Counterparty 6
   
Gross Amounts not offset in the condensed consolidated balance sheet    
Gross Amounts of Assets Presented in the condensed consolidated balance sheet 9,820 12,234
Financial Instruments 1,014 492
Cash Collateral Received 4,039 10,465
Net Amount 4,767 1,277
Gross Amounts not offset in the condensed consolidated balance sheet    
Gross Amounts of Liabilities Presented in the condensed consolidated balance sheet 1,014 492
Financial Instruments 1,014 492
Cash Collateral Pledged 0 0
Net Amount 0 0
Counterparty 7
   
Gross Amounts not offset in the condensed consolidated balance sheet    
Gross Amounts of Assets Presented in the condensed consolidated balance sheet 408 2
Financial Instruments 151 2
Cash Collateral Received 0 0
Net Amount 257 0
Gross Amounts not offset in the condensed consolidated balance sheet    
Gross Amounts of Liabilities Presented in the condensed consolidated balance sheet 151 59
Financial Instruments 151 2
Cash Collateral Pledged 0 57
Net Amount 0 0
Counterparty 8
   
Gross Amounts not offset in the condensed consolidated balance sheet    
Gross Amounts of Assets Presented in the condensed consolidated balance sheet 0 0
Financial Instruments 0 0
Cash Collateral Received 0 0
Net Amount 0 0
Gross Amounts not offset in the condensed consolidated balance sheet    
Gross Amounts of Liabilities Presented in the condensed consolidated balance sheet 730 0
Financial Instruments 0 0
Cash Collateral Pledged 730 0
Net Amount 0 0
Counterparty 9
   
Gross Amounts not offset in the condensed consolidated balance sheet    
Gross Amounts of Assets Presented in the condensed consolidated balance sheet 3,407 68
Financial Instruments 384 68
Cash Collateral Received 0 0
Net Amount 3,023 0
Gross Amounts not offset in the condensed consolidated balance sheet    
Gross Amounts of Liabilities Presented in the condensed consolidated balance sheet 384 904
Financial Instruments 384 68
Cash Collateral Pledged 0 836
Net Amount $ 0 $ 0