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Fair Value Measurement (Quantitative Information Regarding Level 3 Valuations) (Details)
$ in Thousands
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Assets:    
Estimated Fair Value $ 3,531,815 $ 3,833,722
Other investments 270,288 270,816
Level 3    
Assets:    
Equity investments 4,625 2,500
Other investments 901 1,434
Liabilities:    
Other liabilities $ 24,000 24,000
Level 3 | Comparability Adjustment | Minimum    
Assets:    
Equity securities measured at fair value 0  
Level 3 | Comparability Adjustment | Maximum    
Assets:    
Equity securities measured at fair value 0.10  
Level 3 | Comparability Adjustment | Weighted Average    
Assets:    
Equity securities measured at fair value 0.05  
Level 3 | Comparability Adjustment | Discounted Cash Flows | Minimum    
Assets:    
Other investments, measurement input 0  
Level 3 | Comparability Adjustment | Discounted Cash Flows | Maximum    
Assets:    
Other investments, measurement input 0.10  
Level 3 | Comparability Adjustment | Discounted Cash Flows | Weighted Average    
Assets:    
Other investments, measurement input 0.05  
Level 3 | Comparability Adjustment | Stochastic Model/Discounted Cash Flows | Minimum    
Liabilities:    
Other Liabilities, Measurement Input 0.00%  
Level 3 | Comparability Adjustment | Stochastic Model/Discounted Cash Flows | Maximum    
Liabilities:    
Other Liabilities, Measurement Input 10.00%  
Level 3 | Comparability Adjustment | Stochastic Model/Discounted Cash Flows | Weighted Average    
Liabilities:    
Other Liabilities, Measurement Input 8.00%  
Corporate debt, limited observable inputs | Level 3    
Assets:    
Estimated Fair Value $ 74,212 47,129
Corporate debt, limited observable inputs | Level 3 | Comparability Adjustment | Market Comparable Securities | Minimum    
Assets:    
Assets measured at fair value 0  
Corporate debt, limited observable inputs | Level 3 | Comparability Adjustment | Market Comparable Securities | Maximum    
Assets:    
Assets measured at fair value 0.05  
Corporate debt, limited observable inputs | Level 3 | Comparability Adjustment | Market Comparable Securities | Weighted Average    
Assets:    
Assets measured at fair value 0.025  
Corporate debt, limited observable inputs | Level 3 | Comparability Adjustment | Discounted Cash Flows | Minimum    
Assets:    
Assets measured at fair value 0  
Corporate debt, limited observable inputs | Level 3 | Comparability Adjustment | Discounted Cash Flows | Maximum    
Assets:    
Assets measured at fair value 0.05  
Corporate debt, limited observable inputs | Level 3 | Comparability Adjustment | Discounted Cash Flows | Weighted Average    
Assets:    
Assets measured at fair value 0.025  
Residential mortgage-backed securities | Level 3    
Assets:    
Estimated Fair Value $ 273 297
Residential mortgage-backed securities | Level 3 | Comparability Adjustment | Market Comparable Securities | Minimum    
Assets:    
Assets measured at fair value 0  
Residential mortgage-backed securities | Level 3 | Comparability Adjustment | Market Comparable Securities | Maximum    
Assets:    
Assets measured at fair value 0.05  
Residential mortgage-backed securities | Level 3 | Comparability Adjustment | Market Comparable Securities | Weighted Average    
Assets:    
Assets measured at fair value 0.025  
Residential mortgage-backed securities | Level 3 | Comparability Adjustment | Discounted Cash Flows | Minimum    
Assets:    
Assets measured at fair value 0  
Residential mortgage-backed securities | Level 3 | Comparability Adjustment | Discounted Cash Flows | Maximum    
Assets:    
Assets measured at fair value 0.05  
Residential mortgage-backed securities | Level 3 | Comparability Adjustment | Discounted Cash Flows | Weighted Average    
Assets:    
Assets measured at fair value 0.025  
Other commercial mortgage-backed securities | Level 3    
Assets:    
Estimated Fair Value $ 565 0
Other commercial mortgage-backed securities | Level 3 | Comparability Adjustment | Market Comparable Securities | Minimum    
Assets:    
Assets measured at fair value 0  
Other commercial mortgage-backed securities | Level 3 | Comparability Adjustment | Market Comparable Securities | Maximum    
Assets:    
Assets measured at fair value 0.05  
Other commercial mortgage-backed securities | Level 3 | Comparability Adjustment | Market Comparable Securities | Weighted Average    
Assets:    
Assets measured at fair value 0.025  
Other commercial mortgage-backed securities | Level 3 | Comparability Adjustment | Discounted Cash Flows | Minimum    
Assets:    
Assets measured at fair value 0  
Other commercial mortgage-backed securities | Level 3 | Comparability Adjustment | Discounted Cash Flows | Maximum    
Assets:    
Assets measured at fair value 0.05  
Other commercial mortgage-backed securities | Level 3 | Comparability Adjustment | Discounted Cash Flows | Weighted Average    
Assets:    
Assets measured at fair value 0.025  
Other asset-backed securities | Level 3    
Assets:    
Estimated Fair Value $ 3,200 $ 6,205
Other asset-backed securities | Level 3 | Comparability Adjustment | Market Comparable Securities | Minimum    
Assets:    
Assets measured at fair value 0  
Other asset-backed securities | Level 3 | Comparability Adjustment | Market Comparable Securities | Maximum    
Assets:    
Assets measured at fair value 0.05  
Other asset-backed securities | Level 3 | Comparability Adjustment | Market Comparable Securities | Weighted Average    
Assets:    
Assets measured at fair value 0.025  
Other asset-backed securities | Level 3 | Comparability Adjustment | Discounted Cash Flows | Minimum    
Assets:    
Assets measured at fair value 0  
Other asset-backed securities | Level 3 | Comparability Adjustment | Discounted Cash Flows | Maximum    
Assets:    
Assets measured at fair value 0.05  
Other asset-backed securities | Level 3 | Comparability Adjustment | Discounted Cash Flows | Weighted Average    
Assets:    
Assets measured at fair value 0.025