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Recent Accounting Pronouncements (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Item Effected [Line Items]    
Assets $ 6,051,463 $ 5,887,284
Liabilities and shareholders' equity 6,051,463 $ 5,887,284
Minimum | Accounting Standards Update 2016-02    
Item Effected [Line Items]    
Assets 7,000  
Liabilities and shareholders' equity 7,000  
Maximum | Accounting Standards Update 2016-02    
Item Effected [Line Items]    
Assets 10,000  
Liabilities and shareholders' equity 10,000  
Accounting Standards Update 2018-02    
Item Effected [Line Items]    
Reclassification of tax effects related to the Tax Cuts and Jobs Act $ 720