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Leases:Topic 842 Adoption (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease liabilities $ 68,834 $ 72,400  
Retained earnings 385,661   $ 330,056
Property and equipment, net 464,373 465,492 487,224
Operating lease right-of-use assets 65,571 69,155 0
Finance lease right-of-use assets 22,238 20,872 0
Prepaid expenses and other 14,156 31,572 31,818
Accrued liabilities, other 80,996 72,372 63,509
Operating lease liabilities, net of current portion 59,591 63,498 0
Finance lease liabilities, net of current portion 23,661 21,921 0
Other long-term liabilities 12,932 12,671 $ 38,904
Accounting Standards Update 2016-02 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Retained earnings   0  
Property and equipment, net   (21,732)  
Operating lease right-of-use assets   69,155  
Finance lease right-of-use assets   20,872  
Prepaid expenses and other   (246)  
Accrued liabilities, other   8,863  
Operating lease liabilities, net of current portion   63,498  
Finance lease liabilities, net of current portion   21,921  
Other long-term liabilities   $ (26,233)  
If Accounting Standards Update 2016-02 was Not Adopted [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Property and equipment, net 487,432    
Operating lease right-of-use assets 0    
Finance lease right-of-use assets 0    
Prepaid expenses and other 14,436    
Accrued liabilities, other 71,753    
Operating lease liabilities, net of current portion 0    
Finance lease liabilities, net of current portion 0    
Other long-term liabilities 40,957    
Impact of Accounting Standards Update 2016-02 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Property and equipment, net (23,059)    
Operating lease right-of-use assets 65,571    
Finance lease right-of-use assets 22,238    
Prepaid expenses and other (280)    
Accrued liabilities, other 9,243    
Operating lease liabilities, net of current portion 59,591    
Finance lease liabilities, net of current portion 23,661    
Other long-term liabilities $ (28,025)