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Accounting Policies - Cash used in investing activities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Condensed Cash Flow Statements, Captions [Line Items]        
Cash used in investing activities     $ (35,326) $ (98,210)
Cost of sales $ 474,388 $ 434,465 929,168 894,915
Selling, general and administrative expenses $ 24,756 22,456 $ 50,704 43,218
Accounting Standards Update 2016-08        
Condensed Cash Flow Statements, Captions [Line Items]        
Cost of sales   (600)   (1,500)
Selling, general and administrative expenses   $ 300   500
Cash used in investing activities previously reported        
Condensed Cash Flow Statements, Captions [Line Items]        
Cash used in investing activities       (68,915)
Withdrawals of restricted cash | Accounting Standards Update 2016-08        
Condensed Cash Flow Statements, Captions [Line Items]        
Cash used in investing activities       $ 29,295