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Debt and Credit Facility Debt and Credit Facility, Narrative (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
May 15, 2016
USD ($)
May 23, 2012
USD ($)
Debt Instrument [Line Items]              
Unamortized Debt Issuance Expense $ 6,800,000   $ 6,800,000        
Long-term debt [1] $ 368,200,000   $ 368,200,000   $ 194,600,000    
Senior Notes Due 2024 [Member] | 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, Interest Rate, Stated Percentage           5.875%  
Debt issuance, percentage of principal amount           100.00%  
Interest Expense, Long-term Debt $ 3,100,000   $ 3,100,000        
Debt Instrument, Fair Value Disclosure 383,400,000   383,400,000        
Senior Notes Due 2020 [Member] | Senior Notes              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount             $ 225,000,000
Debt Instrument, Interest Rate, Stated Percentage             8.25%
Debt Instrument, Periodic Payment, Principal         27,200,000    
Long-term debt 197,800,000   197,800,000   $ 197,800,000    
Interest Expense, Long-term Debt 2,800,000 $ 4,900,000 7,100,000 $ 9,700,000      
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 [Member] | Line of Credit [Member]              
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 [Member] | Letter of Credit [Member]              
Debt Instrument [Line Items]              
Long-term Line of Credit $ 7,300,000   $ 7,300,000        
Upon receipt of the proceeds of certain asset sales [Member] | Senior Notes Due 2024 [Member] | Senior Notes              
Debt Instrument [Line Items]              
Debt Instrument, Redemption Price, Percentage     100.00%        
On or after May 15, 2019 [Member] | Senior Notes Due 2024 [Member] | Senior Notes              
Debt Instrument [Line Items]              
Debt Instrument, Redemption Price, Percentage     104.406%        
On or after May 15, 2020 [Member] | Senior Notes Due 2024 [Member] | Senior Notes              
Debt Instrument [Line Items]              
Debt Instrument, Redemption Price, Percentage     102.938%        
On or after May 15, 2021 [Member] | Senior Notes Due 2024 [Member] | Senior Notes              
Debt Instrument [Line Items]              
Debt Instrument, Redemption Price, Percentage     101.469%        
On or after June 1, 2016 [Member] | Senior Notes Due 2020 [Member] | Senior Notes              
Debt Instrument [Line Items]              
Debt Instrument, Redemption Price, Percentage 104.125%            
On or after May 15, 2022 [Member] | Senior Notes Due 2024 [Member] | Senior Notes              
Debt Instrument [Line Items]              
Debt Instrument, Redemption Price, Percentage     100.00%        
Any time prior to May 15, 2019 [Member] | Senior Notes Due 2024 [Member] | Senior Notes              
Debt Instrument [Line Items]              
Debt Instrument, Redemption Price, Percentage     100.00%        
Exchange Offer Registration Timeline     240 days        
Change in control [Member] | Senior Notes Due 2024 [Member] | 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, ASU 2015-15 and ASU 2015-17 (as defined in Note 1).