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Commitments and Contingent Liabilities (Credit Facility) (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Credit Facility One Hundred Million [Member]    
Line Of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 100,000  
Maturity Date June 2017  
Amount Utilized [1] $ 76,029 $ 81,747
Basis Of Fees Fixed  
Credit Facility Fifty Three Million [Member]    
Line Of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity [2] $ 76,310  
Maturity Date November 2015  
Amount Utilized [1] $ 76,310 74,623
Basis Of Fees Fixed  
Credit Facility 270 Million [Member]    
Line Of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 270,000  
Maturity Date November 2017  
Amount Utilized [1] $ 270,000 270,000
Basis Of Fees Fixed  
Credit Facility 120 Million [Member]    
Line Of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 120,000  
Maturity Date May 2016  
Amount Utilized [1] $ 80,040 80,040
Basis Of Fees Fixed  
Credit Facility 850 Million [Member]    
Line Of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 850,000  
Maturity Date September 2019  
Amount Utilized $ 401,856 [1] 204,774
Basis Of Fees Senior unsecured long-term debt rating  
Credit Facility One Hundred Fifty Million [Member]    
Line Of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity [2] $ 38,535  
Maturity Date March 2019  
Amount Utilized [1] $ 51,892 80,961
Basis Of Fees Fixed  
Credit Facility One Hundred Fifty Million [Member]    
Line Of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 150,000  
Maturity Date June 2016  
Amount Utilized [1] $ 130,000 130,000
Basis Of Fees Fixed  
Credit Facility Forty Seven Million [Member]    
Line Of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity [2] $ 51,892  
Maturity Date May 2016  
Amount Utilized [1] $ 26,975 $ 28,612
Basis Of Fees Fixed  
[1] Represents issued but undrawn letters of credit. There was no cash borrowed for the periods presented.
[2] Foreign currency facility, amounts presented are in U.S. dollars.