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Going Concern Going Concern (Details)
3 Months Ended
Mar. 31, 2016
USD ($)
Jun. 30, 2016
Apr. 13, 2016
USD ($)
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]        
Long-term debt, gross $ 1,544,000,000      
Long-term debt 1,522,300,000     $ 1,061,000,000
Fair value of amount outstanding 457,000,000      
Current portion of long-term debt $ 459,201,000     $ 0
Covenant Compliance        
Debt Instrument [Line Items]        
Consolidated funded debt to consolidated EBITDA ratio 3.75      
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]        
Long-term debt $ 457,000,000     $ 0
Borrowing base 500,000,000      
Outstanding borrowing under bank credit facility 19,200,000      
Current portion of long-term debt $ 175,300,000      
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      
Senior Notes        
Debt Instrument [Line Items]        
Long-term debt $ 1,075,000,000      
Scenario, Forecast | Covenant Compliance        
Debt Instrument [Line Items]        
Consolidated funded debt to consolidated EBITDA ratio   3.75    
Subsequent Event        
Debt Instrument [Line Items]        
Fair value of amount outstanding     $ 457,000,000  
Subsequent Event | Revolving credit facility        
Debt Instrument [Line Items]        
Borrowing base     300,000,000  
Outstanding borrowing under bank credit facility     18,300,000  
Current portion of long-term debt     $ 175,300,000