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Indebtedness (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Subsidiary Debt    
Debt Instrument [Line Items]    
Face Value $ 81,752  
Carrying Value [1] 81,752 $ 154,223
Repayments in 2015   43,000
Repayments in 2016   37,000
Repayments thereafter   2,000
Senior Notes and Other Debt    
Debt Instrument [Line Items]    
Face Value 1,858,255  
Carrying Value 1,844,621 $ 2,115,527
Senior Notes | Senior Notes due May 15, 2015    
Debt Instrument [Line Items]    
Rate   5.60%
Face Value 0  
Carrying Value 0 $ 199,930
Senior Notes | Senior Notes due August 15, 2019    
Debt Instrument [Line Items]    
Rate   6.15%
Face Value 150,000  
Carrying Value 149,484 $ 149,342
Senior Notes | Senior Notes due September 15, 2019    
Debt Instrument [Line Items]    
Rate   7.375%
Face Value 300,000  
Carrying Value 299,054 $ 298,800
Senior Notes | Senior Notes due September 15, 2020    
Debt Instrument [Line Items]    
Rate   5.375%
Face Value 300,000  
Carrying Value 298,411 $ 298,074
Senior Notes | Senior Notes due January 1, 2022    
Debt Instrument [Line Items]    
Rate   8.70%
Face Value 76,503  
Carrying Value 76,097 $ 76,048
Senior Notes | Senior Notes due March 15, 2022    
Debt Instrument [Line Items]    
Rate   4.625%
Face Value 350,000  
Carrying Value 347,417 $ 346,999
Senior Notes | Senior Notes due February 15, 2037    
Debt Instrument [Line Items]    
Rate   6.25%
Face Value 250,000  
Carrying Value 247,676 $ 247,566
Senior Notes | Senior Notes due August 1, 2044 [Member]    
Debt Instrument [Line Items]    
Rate   4.75%
Face Value 350,000  
Carrying Value 344,730 $ 344,545
Junior Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Face Value   350,000
Carrying Value $ 340,320 $ 340,060
Junior Subordinated Debt [Member] | Five Point Six Two Five Percent Subordinated Debentures [Member]    
Debt Instrument [Line Items]    
Rate   5.625%
[1] Subsidiary debt is due as follows: $43 million in 2016, $37 million in 2017 and $2 million thereafter.