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Recent Accounting Pronouncements Recent Accounting Pronouncements (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 01, 2017
Jul. 01, 2017
Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Restricted cash $ 0 $ 0 $ 23,540
Accounting Standards Update 2017-07      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Prior Period Reclassification Adjustment $ 5,028 $ 10,189