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Going Concern (Details)
6 Months Ended
Jun. 14, 2016
USD ($)
Jun. 13, 2016
USD ($)
May 13, 2016
USD ($)
Jun. 30, 2016
USD ($)
Apr. 13, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]              
Long-term debt, gross       $ 1,428,000,000      
Consolidated funded debt to consolidated EBITDA ratio       3.75      
Fair value of amount outstanding       $ 341,500,000 $ 457,000,000    
Current portion of long-term debt       288,336,000     $ 0
Repayments of Lines of Credit $ 56,800,000            
Long-term debt       $ 1,411,200,000     $ 1,061,000,000
Convertible Debt | 1.75% Senior Notes due 2017              
Debt Instrument [Line Items]              
Interest rate       1.75%     1.75%
Revolving credit facility              
Debt Instrument [Line Items]              
Line of Credit Facility, Minimum Liquidity Requirement 125,000,000            
Line of Credit Facility, Amount of Cash to Which Anti-Hoarding Cash Provisions Apply 50,000,000            
Borrowing base $ 360,000,000       300,000,000 $ 500,000,000  
Outstanding borrowing under bank credit facility       $ 18,300,000 18,300,000    
Current portion of long-term debt         $ 175,300,000    
Repayments of Lines of Credit   $ 29,200,000 $ 29,200,000        
Period in which outstanding amount has to be repaid to cure deficiency       10 days      
Period in which bank has to add new properties to borrowing base and has to grant mortgage to banks       30 days      
Long-term debt       $ 341,500,000     $ 0
Senior Notes | 7 1⁄2% Senior Notes due 2022              
Debt Instrument [Line Items]              
Interest rate       7.50%     7.50%
4.20% Building Loan              
Debt Instrument [Line Items]              
Current portion of long-term debt       $ 400,000      
Long-term debt       $ 11,500,000     $ 11,700,000
Interest rate       4.20%     4.20%
Quarter ended June 30, 2016              
Debt Instrument [Line Items]              
Consolidated funded debt to consolidated EBITDA ratio 5.25            
Quarter ending September 30, 2016              
Debt Instrument [Line Items]              
Consolidated funded debt to consolidated EBITDA ratio 6.50            
Quarter ending December 31, 2016              
Debt Instrument [Line Items]              
Consolidated funded debt to consolidated EBITDA ratio 9.50            
Thereafter              
Debt Instrument [Line Items]              
Consolidated funded debt to consolidated EBITDA ratio 3.75