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Debt - Credit Facility (Details) - Long-term Debt [Member]
May. 24, 2013
USD ($)
Sep. 30, 2015
USD ($)
Nov. 27, 2013
USD ($)
U.S. revolving credit facility [Member]      
Line of Credit Facility [Line Items]      
Credit facility face amount $ 150,000,000    
Credit facility maximum amount   $ 150,000,000  
Borrowing availability, net of outstanding letters of credit   50,026,000  
Outstanding borrowings   0  
Covenant terms, fixed-charge coverage ratio 1.1    
Covenant terms, minimum available borrowing capacity $ 15,000,000    
U.S. letter of credit [Member]      
Line of Credit Facility [Line Items]      
Letter of credit sub-facility amount $ 110,000,000 110,000,000  
Outstanding letters of credit issued   63,005,000  
Iceland revolving line of credit [Member]      
Line of Credit Facility [Line Items]      
Credit facility face amount     $ 50,000,000
Credit facility maximum amount   50,000,000  
Borrowing availability, net of outstanding letters of credit   50,000,000  
Outstanding borrowings   $ 0