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Long-term Debt - Senior Notes - Narrative (Details) (USD $)
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Mar. 31, 2013
Senior Notes [Member]
5.375% Senior Notes [Member]
Jun. 30, 2014
Senior Notes [Member]
5.375% Senior Notes [Member]
Feb. 28, 2013
Senior Notes [Member]
5.375% Senior Notes [Member]
Jun. 30, 2014
Senior Notes [Member]
5.375% Senior Notes [Member]
Level 2 Securities [Member]
Dec. 31, 2013
Senior Notes [Member]
5.375% Senior Notes [Member]
Level 2 Securities [Member]
Mar. 31, 2013
Senior Notes [Member]
8.50% Senior Notes [Member]
Jun. 30, 2014
Senior Notes [Member]
5.750% Senior Notes [Member]
Feb. 28, 2014
Senior Notes [Member]
5.750% Senior Notes [Member]
Jun. 30, 2014
Senior Notes [Member]
5.750% Senior Notes [Member]
Level 2 Securities [Member]
Debt Instrument [Line Items]                          
Face amount             $ 500,000,000     $ 200,000,000.0   $ 400,000,000.0  
Interest rate             5.375%     8.50%   5.75%  
Redemption prices, percent of outstanding principal           101.00%         101.00%    
Repayments 0 0 0 219,362,000 224,500,000                
Make-whole premium                   19,400,000      
Interest payable                   5,100,000      
Loss on extinguishment of debt 0 0 0 (25,129,000)           25,100,000      
Write off of unamortized deferred financing costs                   4,200,000      
Senior notes, fair value               $ 523,800,000 $ 506,300,000       $ 418,000,000