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Significant Accounting Policies (Impact Of Adopting Leasing Standard On Balance Sheet) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Operating leases      
Leased right-of-use assets, net $ 45,860    
Prepaid expenses 2,692   $ 1,650
Accrued liabilities 12,290   15,664
Operating lease liabilities, net of current portion 44,550    
Taxes payable and other 2,297   3,381
Retained earnings 76,809   76,056
Non-controlling interests 7,270   7,062
Finance leases      
Property and equipment, net 198,909   187,017
Leased right-of-use assets, net 1,382    
Current portion of long-term debt 17,363   17,482
Current portion of finance lease liabilities 351    
Long-term portion 53,706   42,041
Finance lease liabilities, net of current portion $ 979    
Prior To Adoption [Member]      
Operating leases      
Prepaid expenses     1,650
Accrued liabilities     15,664
Taxes payable and other     3,381
Retained earnings     76,056
Non-controlling interests     7,062
Finance leases      
Property and equipment, net     187,017
Current portion of long-term debt     17,482
Long-term portion     $ 42,041
Post Adoption [Member]      
Operating leases      
Leased right-of-use assets, net   $ 38,276  
Prepaid expenses   1,514  
Accrued liabilities   15,025  
Operating lease liabilities, net of current portion   40,410  
Taxes payable and other   2,031  
Retained earnings   75,824  
Non-controlling interests   7,013  
Finance leases      
Property and equipment, net   186,655  
Leased right-of-use assets, net   362  
Current portion of long-term debt   17,359  
Current portion of finance lease liabilities   123  
Long-term portion   41,731  
Finance lease liabilities, net of current portion   310  
Accounting Standards Update 2016-02 [Member] | Changes Related To Adoption [Member]      
Operating leases      
Leased right-of-use assets, net   38,276  
Prepaid expenses   (136)  
Accrued liabilities   (639)  
Operating lease liabilities, net of current portion   40,410  
Taxes payable and other   (1,350)  
Retained earnings   (232)  
Non-controlling interests   (49)  
Finance leases      
Property and equipment, net   (362)  
Leased right-of-use assets, net   362  
Current portion of long-term debt   (123)  
Current portion of finance lease liabilities   123  
Long-term portion   (310)  
Finance lease liabilities, net of current portion   $ 310