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Adoption of Accounting Pronouncements(Other Information) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Other assets $ 78,339 $ 66,607  
Total Assets 6,904,433 6,574,942  
Notes payable 388,192 372,689  
Liabilities 5,506,392 5,299,356  
Total Liabilities and Stockholders' Equity 6,904,433 6,574,942  
Interest expense 22,428 23,063 $ 26,361
Other expenses $ 38,371 32,696 31,863
Restatement Adjustment [Member]      
Other assets   66,607  
Total Assets   6,574,942  
Notes payable   372,689  
Liabilities   5,299,356  
Total Liabilities and Stockholders' Equity   6,574,942  
Interest expense   23,063 26,361
Other expenses   32,696 31,863
Scenario, Previously Reported [Member]      
Other assets   73,215  
Total Assets   6,581,550  
Notes payable   379,297  
Liabilities   5,305,964  
Total Liabilities and Stockholders' Equity   6,581,550  
Interest expense   22,086 22,538
Other expenses   $ 33,673 $ 35,686