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Long-Term Debt - Summary (Details)
3 Months Ended 9 Months Ended
Oct. 04, 2018
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
May 30, 2017
USD ($)
Debt Instrument [Line Items]              
Total long-term debt   $ 600,722,000 $ 434,961,000 $ 600,722,000 $ 434,961,000 $ 402,243,000  
Deferred finance costs, net   $ 4,300,000 5,000,000 $ 4,300,000 5,000,000 4,800,000  
Debt ratio   2.25   2.25      
Loss on extinguishment of debt   $ 0 20,000 $ 0 14,114,000    
Line of Credit Facility, Leverage Ratio       2.75      
Senior notes 2024              
Debt Instrument [Line Items]              
Stated interest rate (percent)             5.375%
Face amount             $ 300,000,000
Senior notes 2021              
Debt Instrument [Line Items]              
Stated interest rate (percent)             6.75%
Face amount             $ 200,000,000
Line of Credit              
Debt Instrument [Line Items]              
Amount outstanding   305,000,000 140,000,000 $ 305,000,000 140,000,000 107,000,000  
Maximum borrowing capacity   400,000,000   400,000,000      
Letters of credit outstanding, amount   3,200,000   3,200,000      
Remaining borrowing capacity   $ 91,800,000   $ 91,800,000      
Unused capacity, commitment fee (percent)       0.50%      
Interest rate at end of period (percent)   4.66%   4.66%      
Net proceeds       $ 198,000,000      
Line of Credit | 30-day LIBOR              
Debt Instrument [Line Items]              
Basis spread on variable rate (percent)       2.50%      
Line of Credit | Prime Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate (percent)       1.50%      
Line of Credit | Minimum | 30-day LIBOR              
Debt Instrument [Line Items]              
Stated interest rate (percent)   0.00%   0.00%      
Senior notes 2024              
Debt Instrument [Line Items]              
Total long-term debt   $ 295,722,000 $ 294,961,000 $ 295,722,000 $ 294,961,000 $ 295,243,000  
Stated interest rate (percent)   5.375%   5.375%      
Subsequent Event              
Debt Instrument [Line Items]              
Line of Credit Facility, Leverage Ratio 3.0            
Subsequent Event | Line of Credit              
Debt Instrument [Line Items]              
Maximum borrowing capacity $ 425,000,000            
Geographic Distribution, Domestic              
Debt Instrument [Line Items]              
Line of Credit Facility, Leverage Ratio       3.5      
Geographic Distribution, Domestic | Subsequent Event              
Debt Instrument [Line Items]              
Line of Credit Facility, Leverage Ratio 4.0