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Long-Term Debt (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Debt Instrument [Line Items]          
Lease Expiration Date Jun. 01, 2034        
Net carrying amount of liability component $ 1,140,120 $ 1,140,120 $ 1,081,467    
Current maturities of long-term debt 55,959 55,959 72,630    
LONG-TERM DEBT, net of current maturities 1,084,161 1,084,161 1,008,837    
5.00% Senior Note [Member]          
Debt Instrument [Line Items]          
Unsecured Long-term Debt, Noncurrent 540,957 540,957 540,100    
Long-term Debt Underwriters Fees and Discount Original       $ 10,400  
Debt Issuance Cost   2,600      
Debt Instrument, Face Amount 550,000 550,000 550,000 $ 200,000 $ 350,000
Real Estate Related Debt [Member]          
Debt Instrument [Line Items]          
Debt Issuance Cost   1,300      
Mortgages [Member]          
Debt Instrument [Line Items]          
Other Real Estate Related and Long-Term Debt 55,498 55,498 58,003    
Real Estate Credit Facility [Member]          
Debt Instrument [Line Items]          
Debt Issuance Cost   1,100      
Current maturities of long-term debt 30,900 30,900      
Other Real Estate Related Long-Term Debt [Member]          
Debt Instrument [Line Items]          
Other Real Estate Related and Long-Term Debt 352,576 352,576 358,271    
Capital Lease Obligations [Member]          
Debt Instrument [Line Items]          
Capital lease obligations related to real estate, maturing in varying amounts through June 2034 with a weighted average interest rate of 9.7% 52,888 52,888 $ 55,380    
Third Party Financial Institution [Member]          
Debt Instrument [Line Items]          
Current maturities of long-term debt 6,100 6,100      
Foreign Note [Member]          
Debt Instrument [Line Items]          
Current maturities of long-term debt 4,600 4,600      
Ford Motor Credit Company [Member] | Third Party Financial Institution [Member]          
Debt Instrument [Line Items]          
Current maturities of long-term debt 1,500 1,500      
Bmw Financial Services [Member] | Real Estate Related Debt [Member]          
Debt Instrument [Line Items]          
Current maturities of long-term debt 4,600 4,600      
Mercedes Benz Financial Services [Member] | Real Estate Related Debt [Member]          
Debt Instrument [Line Items]          
Current maturities of long-term debt 1,200 1,200      
Toyota Motor Credit Corporation [Member] | Real Estate Related Debt [Member]          
Debt Instrument [Line Items]          
Current maturities of long-term debt $ 2,200 $ 2,200