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Adoption of ASC 842, "Leases" (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Dec. 30, 2018
Lessee, Lease, Description [Line Items]      
Election of package of practical expedients true    
Election of hindsight practical expedient false    
Assets      
Prepaid expenses $ 22,488 $ 25,707 $ 30,376
Right-of-use assets 150,216 161,027  
Current liabilities:      
Current lease liabilities 22,546 25,348  
Long-term liabilities:      
Long-term lease liabilities 130,391 137,511  
Other long-term liabilities $ 75,887 72,823 79,324
Total Adjustments      
Assets      
Prepaid expenses     $ 441
Accounting Standards Update 2016-02 | Total Adjustments      
Assets      
Prepaid expenses   (4,669)  
Right-of-use assets   161,027  
Current liabilities:      
Current lease liabilities   25,348  
Long-term liabilities:      
Long-term lease liabilities   137,511  
Other long-term liabilities   $ (6,501)