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Commitments and Contingencies Minimum Future Lease Payments for Non-Cancelable Leases (Details) - USD ($)
6 Months Ended
May 29, 2018
Feb. 07, 2018
Nov. 27, 2017
Jul. 24, 2017
Jun. 30, 2018
Jun. 30, 2017
Disclosure Minimum Future Lease Payments For Non Cancelable Leases [Abstract]            
Remainder of 2018         $ 9,213,000  
2019         17,350,000  
2020         13,503,000  
2021         11,827,000  
2022         9,617,000  
Thereafter         20,738,000  
Total minimum future lease payments         82,248,000  
Other Commitments [Line Items]            
Loan repayment from equity investee         $ 30,000,000 $ 0
Minimum purchase commitment $ 425,900,000   $ 305,200,000      
Purchase commitment, period 5 years   4 years      
Maximum | SDC            
Other Commitments [Line Items]            
Loan facility       $ 30,000,000.0    
Loan repayment from equity investee   $ 30,000,000