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Leases:Topic 842 Adoption (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease liabilities $ 69,241 $ 72,400  
Retained earnings 362,057   $ 330,056
Property and equipment, net 464,095 465,492 487,224
Operating lease right-of-use assets 65,989 69,155 0
Finance lease right-of-use assets 20,301 20,872 0
Prepaid expenses and other 17,745 31,572 31,818
Accrued liabilities, other 77,256 72,372 63,509
Operating lease liabilities, net of current portion 60,289 63,498 0
Finance lease liabilities, net of current portion 21,701 21,921 0
Other long-term liabilities 13,721 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 485,232    
Operating lease right-of-use assets 0    
Finance lease right-of-use assets 0    
Prepaid expenses and other 17,991    
Accrued liabilities, other 68,304    
Operating lease liabilities, net of current portion 0    
Finance lease liabilities, net of current portion 0    
Other long-term liabilities 39,756    
Impact of Accounting Standards Update 2016-02 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Property and equipment, net (21,137)    
Operating lease right-of-use assets 65,989    
Finance lease right-of-use assets 20,301    
Prepaid expenses and other (246)    
Accrued liabilities, other 8,952    
Operating lease liabilities, net of current portion 60,289    
Finance lease liabilities, net of current portion 21,701    
Other long-term liabilities $ (26,035)