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Summary of Significant Accounting Policies textuals (Details)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
shares
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Expense Relcass (asu 2017-07) $ 9,000
Visa Restricted Stock Owned | shares 119
AOCI Attributable to Parent [Member]  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Reporting Comprehensive Income(2018-02) $ 13,654