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Adoption of Accounting Pronouncements(Other Information) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Other assets $ 113,534 $ 78,339  
Total Assets 7,355,848 6,904,433  
Long-term debt 438,667 328,192  
Liabilities 5,824,478 5,506,392  
Total Liabilities and Stockholders' Equity 7,355,848 6,904,433  
Interest expense 22,771 22,428 $ 23,063
Other expenses $ 42,989 $ 38,371 32,696
Restatement Adjustment [Member]      
Interest expense     23,063
Other expenses     32,696
Scenario, Previously Reported [Member]      
Interest expense     22,086
Other expenses     $ 33,673