XML 69 R58.htm IDEA: XBRL DOCUMENT v3.7.0.1
Long-term Debt (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Feb. 21, 2017
Feb. 20, 2017
Dec. 31, 2016
Borrowings          
Unamortized discount and debt issuance costs $ (3,500,000)       $ (3,600,000)
Total long term-debt 596,500,000       $ 596,400,000
Proceeds from revolving credit facility $ 50,000,000 $ 0      
3.75% senior notes due 2022          
Borrowings          
Interest rate (as a percent) 3.75%       3.75%
Long-term debt, carrying amount $ 350,000,000       $ 350,000,000
3.75% senior notes due 2022 | Significant Observable Inputs (Level 2)          
Borrowings          
Fair value of notes $ 353,100,000       $ 347,200,000
5.125% senior notes due 2020          
Borrowings          
Interest rate (as a percent) 5.125%       5.125%
Long-term debt, carrying amount $ 250,000,000       $ 250,000,000
5.125% senior notes due 2020 | Significant Observable Inputs (Level 2)          
Borrowings          
Fair value of notes 267,400,000       263,100,000
Revolving Credit Facility | Credit Agreement          
Borrowings          
Maximum borrowing capacity     $ 1,000,000,000.0 $ 600,000,000.0  
Lender fees 1,400,000        
Additional borrowing capacity       500,000,000.0  
Proceeds from revolving credit facility $ 50,000,000        
Effective weighted average interest rate (percent) 3.92%        
Borrowings outstanding $ 0       $ 0
Letter of Credit | Credit Agreement          
Borrowings          
Maximum borrowing capacity       $ 50,000,000.0