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Debt - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2018
4.42% Senior Secured Term Loan | Senior Secured Term Loan      
Debt Instrument [Line Items]      
Repayment of debt   $ 40,000,000  
Early debt extinguishment loss $ 4,200,000 $ 600,000 $ 4,800,000
Weighted-average interest rate 4.42%   4.42%
6.25% Senior Notes | Senior Unsecured Notes      
Debt Instrument [Line Items]      
Weighted-average interest rate 6.25%   6.25%
Effective interest rate 6.52%   6.52%
Revolving credit facility | Term loan facility | Secured line of credit      
Debt Instrument [Line Items]      
Borrowing capacity $ 250,000,000   $ 250,000,000
Unused capacity, commitment fee percentage     0.40%
Consolidated total leverage ratio 2.25   2.25
Revolving credit facility | Term loan facility | Secured line of credit | Leverage Ratio, Less than 2.25      
Debt Instrument [Line Items]      
Unused capacity, commitment fee percentage     0.25%
Revolving credit facility | Term loan facility | Secured line of credit | LIBOR | Minimum      
Debt Instrument [Line Items]      
Basis spread on variable rate     1.75%
Revolving credit facility | Term loan facility | Secured line of credit | LIBOR | Maximum      
Debt Instrument [Line Items]      
Basis spread on variable rate     2.50%
Revolving credit facility | Term loan facility | Secured line of credit | Base rate | Minimum      
Debt Instrument [Line Items]      
Basis spread on variable rate     0.75%
Revolving credit facility | Term loan facility | Secured line of credit | Base rate | Maximum      
Debt Instrument [Line Items]      
Basis spread on variable rate     1.50%
Revolving credit facility | Term loan facility | Senior Secured Term Loan      
Debt Instrument [Line Items]      
Amount outstanding $ 0   $ 0
Letter of credit | Term loan facility | Secured line of credit      
Debt Instrument [Line Items]      
Borrowing capacity 75,000,000   75,000,000
Letter of credit | Term loan facility | Senior Secured Term Loan      
Debt Instrument [Line Items]      
Letters of credit outstanding 2,900,000   2,900,000
Swingline sub-facility | Term loan facility | Secured line of credit      
Debt Instrument [Line Items]      
Borrowing capacity $ 25,000,000   $ 25,000,000