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Stock-based Compensation and Other Employee Benefit Plans Recognized Period Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Allocated Share-based Compensation Expense $ 24,044 $ 27,024 $ 22,018