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Debt and Credit Facility Debt and Credit Facility, Narrative (Details)
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
Jun. 30, 2016
Sep. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Jun. 01, 2016
USD ($)
May 15, 2016
USD ($)
May 23, 2012
USD ($)
Debt Instrument [Line Items]                    
Unamortized Debt Issuance Expense $ 6,500,000       $ 6,500,000          
Long-term debt [1] $ 368,500,000       $ 368,500,000   $ 194,600,000      
Senior Notes Due 2024 | Senior Notes                    
Debt Instrument [Line Items]                    
Debt Instrument, Interest Rate, Effective Percentage 6.10%       6.10%          
Consolidated Total Indebtedness to EBITDA Ratio         2.75          
Debt Instrument, Face Amount                 $ 375,000,000  
Debt instrument contractual rate (percent)                 5.875%  
Debt issuance, percentage of principal amount                 100.00%  
Interest Expense, Long-term Debt $ 5,700,000       $ 8,800,000          
Debt Instrument, Fair Value Disclosure 392,300,000       392,300,000          
Senior Notes Due 2020 | Senior Notes                    
Debt Instrument [Line Items]                    
Debt Instrument, Face Amount                   $ 225,000,000
Debt instrument contractual rate (percent)                   8.25%
Debt Instrument, Periodic Payment, Principal             27,200,000      
Long-term debt             $ 197,800,000 $ 197,800,000    
Interest Expense, Long-term Debt     $ 4,800,000   7,100,000 $ 14,500,000        
Debt Instrument, Redemption Price, Percentage             107.50%      
Repayments of Debt       $ 214,200,000            
Redemption Premium         8,200,000          
Write off of Deferred Debt Issuance Cost         2,900,000          
Debt Instrument, Fair Value Disclosure             $ 207,300,000      
Revolving Credit Facility | Line of Credit                    
Debt Instrument [Line Items]                    
Line of Credit Facility, Maximum Borrowing Capacity 300,000,000       300,000,000          
Line of Credit Facility, Current Borrowing Capacity 287,600,000       287,600,000          
Long-term Line of Credit 0       0          
Line of Credit Facility, Remaining Borrowing Capacity $ 280,300,000       $ 280,300,000          
Line of Credit Facility, Interest Rate at Period End 3.75%       3.75%          
Revolving Credit Facility | Letter of Credit                    
Debt Instrument [Line Items]                    
Long-term Line of Credit $ 7,300,000       $ 7,300,000          
Upon receipt of the proceeds of certain asset sales | Senior Notes Due 2024 | Senior Notes                    
Debt Instrument [Line Items]                    
Debt Instrument, Redemption Price, Percentage         100.00%          
On or after May 15, 2019 | Senior Notes Due 2024 | Senior Notes                    
Debt Instrument [Line Items]                    
Debt Instrument, Redemption Price, Percentage         104.406%          
On or after May 15, 2020 | Senior Notes Due 2024 | Senior Notes                    
Debt Instrument [Line Items]                    
Debt Instrument, Redemption Price, Percentage         102.938%          
On or after May 15, 2021 | Senior Notes Due 2024 | Senior Notes                    
Debt Instrument [Line Items]                    
Debt Instrument, Redemption Price, Percentage         101.469%          
On or after June 1, 2016 | Senior Notes Due 2020 | Senior Notes                    
Debt Instrument [Line Items]                    
Debt Instrument, Redemption Price, Percentage   104.125%                
On or after May 15, 2022 | Senior Notes Due 2024 | Senior Notes                    
Debt Instrument [Line Items]                    
Debt Instrument, Redemption Price, Percentage         100.00%          
Any time prior to May 15, 2019 | Senior Notes Due 2024 | Senior Notes                    
Debt Instrument [Line Items]                    
Debt Instrument, Redemption Price, Percentage         100.00%          
Change in control | Senior Notes Due 2024 | Senior Notes                    
Debt Instrument [Line Items]                    
Debt Instrument, Redemption Price, Percentage         101.00%          
[1] See Note 1 for discussion of our adoption of ASU 2015-03 and ASU 2015-17 (as defined in Note 1).