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Debt (Details) (USD $)
3 Months Ended 6 Months Ended 1 Months Ended 1 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Senior Secured Credit Facility
May 29, 2013
Senior Secured Credit Facility
Mar. 31, 2013
Senior Secured Credit Facility
Apr. 30, 2012
2022 Notes
Jun. 30, 2013
2022 Notes
Jan. 31, 2011
January Notes
Oct. 31, 2011
October Notes
Jun. 30, 2013
2019 Notes
Jun. 30, 2013
Letters of credit
Aug. 01, 2013
Subsequent events
Senior Secured Credit Facility
Debt Disclosure [Abstract]                            
Cash payments for interest $ 20,816,000 $ 1,356,000 $ 48,560,000 $ 28,461,000                    
Amortization and write-off of deferred loan costs and other adjustments 1,320,000 1,240,000 2,624,000 2,321,000                    
Change in accrued interest 3,924,000 19,204,000 320,000 6,081,000                    
Interest costs incurred 26,060,000 21,800,000 51,504,000 36,863,000                    
Less capitalized interest (117,000) (126,000) (212,000) (505,000)                    
Total interest expense 25,943,000 21,674,000 51,292,000 36,358,000                    
Debt                            
Debt issued               500,000,000   350,000,000 200,000,000      
Interest rate (as a percent)                 7.375%     9.50%    
Borrowing capacity         1,000,000,000 1,000,000,000 825,000,000           20,000,000 825,000,000
Outstanding amount         $ 395,000,000                  
Interest rate at period end (as a percent)         2.25%