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New Accounting Pronouncements New Accounting Pronouncements (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Income Tax Expense (Benefit) $ 2,246 $ 1,043 $ 177 $ 75
Net Cash Provided by (Used in) Operating Activities     31,326 1,426
Net Cash Provided by (Used in) Financing Activities     (13,731) 213,788
Accounting Standards Update 2016-09, Statutory Tax Withholding Component        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Income Tax Expense (Benefit)     $ (200)  
Net Cash Provided by (Used in) Operating Activities       1,500
Net Cash Provided by (Used in) Financing Activities       $ (1,500)