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Debt - (Additional Information) (Details) - USD ($)
3 Months Ended 9 Months Ended
Aug. 04, 2017
Dec. 31, 2017
Jan. 01, 2017
Dec. 31, 2017
Jan. 01, 2017
Aug. 03, 2017
Mar. 31, 2017
Apr. 23, 2015
Debt Instrument [Line Items]                
Increase in borrowing capacity limit $ 325,000,000              
Company owned capital stock, percentage securing senior secured credit facility 65.00%              
Short-term debt   $ 16,842,000   $ 16,842,000     $ 18,359,000  
Short-term debt, weighted average interest rate   8.00%   8.00%     7.00%  
Debt issuance costs $ 2,677,000     $ 2,677,000 $ 0      
Write off of debt issuance costs 301,000              
Amortization expense relating to debt issuance costs and included in interest expense   $ 314,000 $ 347,000 988,000 $ 1,041,000      
Deferred issuance costs, net of accumulated amortization   6,279,000   6,279,000     $ 4,891,000  
5.00% Senior Notes due 2023                
Debt Instrument [Line Items]                
Long-term debt   $ 300,000,000   $ 300,000,000     300,000,000 $ 300,000,000
Interest rate   5.00%   5.00%       5.00%
Convertible Notes Payable                
Debt Instrument [Line Items]                
Available lines of credit   $ 503,807,000   $ 503,807,000     475,947,000  
Stand by letters of credit   3,074,000   3,074,000     2,189,000  
Outstanding amount   150,832,000   150,832,000     $ 142,872,000  
2017 Credit Facility, due 2022 | Revolving Credit Facility                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity 600,000,000              
Available lines of credit   245,300,000   245,300,000        
2017 Credit Facility, due 2022 | Secured Debt                
Debt Instrument [Line Items]                
Debt instrument, face amount 150,000,000              
Available lines of credit   $ 150,000,000   $ 150,000,000        
2011 Credit Facility, due 2018 | Revolving Credit Facility                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity           $ 500,000,000    
Available lines of credit 240,000,000              
2011 Credit Facility, due 2018 | Secured Debt                
Debt Instrument [Line Items]                
Debt instrument, face amount           $ 150,000,000    
Available lines of credit $ 123,750,000              
LIBOR | 2017 Revolver And 2017 Term Loan                
Debt Instrument [Line Items]                
Basis spread on variable rate 1.25%              
LIBOR | 2017 Revolver And 2017 Term Loan | Minimum                
Debt Instrument [Line Items]                
Basis spread on variable rate 1.25%              
LIBOR | 2017 Revolver And 2017 Term Loan | Maximum                
Debt Instrument [Line Items]                
Basis spread on variable rate 2.00%              
Federal Funds Effective Rate | 2017 Revolver And 2017 Term Loan                
Debt Instrument [Line Items]                
Basis spread on variable rate 0.50%              
Eurocurrency Base Rate | 2017 Revolver And 2017 Term Loan                
Debt Instrument [Line Items]                
Basis spread on variable rate 1.00%              
Debt Instrument Quarterly Installments Beginning December 31, 2018 Through December 30, 2019                
Debt Instrument [Line Items]                
Debt instrument, periodic payment $ 1,875,000              
Debt Instrument Quarterly Installments Beginning December 31, 2019 Through December 30, 2020                
Debt Instrument [Line Items]                
Debt instrument, periodic payment 2,813,000              
Debt Instrument Quarterly Installments Beginning December 31, 2020 Through September 29, 2022                
Debt Instrument [Line Items]                
Debt instrument, periodic payment 3,750,000              
Debt Instrument Final Installments Payable On September 30, 2022                
Debt Instrument [Line Items]                
Debt instrument, periodic payment $ 105,000,000