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Investments (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
securities
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
securities
Jun. 30, 2015
USD ($)
securities
Dec. 31, 2015
USD ($)
securities
Schedule of Investments [Line Items]          
Available-for-sale securities in unrealized loss position, number of positions | securities 216   216   659
Available-for-sale securities, estimated fair value $ 856,052   $ 856,052   $ 2,843,837
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses $ (43,521)   $ (43,521)   $ (95,896)
Number of available-for-sale securities positions in a continuous unrealized loss position for one year or longer at period end | securities 126   126   271
Available-for-sale securities, estimated fair value, 12 months or longer $ 367,263   $ 367,263   $ 813,147
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer (6,569)   (6,569)   (19,842)
Other-than-temporary impairment losses recognized in net income (3,675) $ 0 (12,080) $ (5,092)  
Fixed Maturities [Member]          
Schedule of Investments [Line Items]          
Available-for-sale securities, estimated fair value 459,349   459,349   2,296,480
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses $ (8,926)   $ (8,926)   $ (44,205)
Number of available-for-sale securities positions in a continuous unrealized loss position for one year or longer at period end | securities 119   119   264
Available-for-sale securities, estimated fair value, 12 months or longer $ 339,444   $ 339,444   $ 803,993
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer (4,503)   (4,503)   (19,423)
Equity Securities [Member]          
Schedule of Investments [Line Items]          
Available-for-sale securities, estimated fair value 296,726   296,726   417,884
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses $ (34,594)   $ (34,594)   $ (51,682)
Number of available-for-sale securities positions in a continuous unrealized loss position for one year or longer at period end | securities 7   7   7
Available-for-sale securities, estimated fair value, 12 months or longer $ 27,819   $ 27,819   $ 9,154
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer (2,066)   (2,066)   (419)
Other-than-temporary impairment losses recognized in net income $ (3,700)   $ (12,100) $ (5,100)  
Other than temporary impairment losses recognized in earnings, number of investment positions | securities 12   21 10  
Industrial, Consumer And All Other [Member]          
Schedule of Investments [Line Items]          
Available-for-sale securities, estimated fair value $ 218,989   $ 218,989   347,764
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses (21,953)   (21,953)   (45,131)
Available-for-sale securities, estimated fair value, 12 months or longer 27,819   27,819   2,907
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer (2,066)   (2,066)   (252)
Other-than-temporary impairment losses recognized in net income (3,000)   (10,800) $ (4,500)  
Insurance, Banks And Other Financial Institutions [Member]          
Schedule of Investments [Line Items]          
Available-for-sale securities, estimated fair value 77,737   77,737   70,120
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses (12,641)   (12,641)   (6,551)
Available-for-sale securities, estimated fair value, 12 months or longer 0   0   6,247
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer 0   0   $ (167)
Other-than-temporary impairment losses recognized in net income $ (600)   $ (1,300) $ (600)