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LONG-TERM DEBT (Details 3) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Mar. 31, 2017
Mar. 31, 2015
Long-term debt            
Payments of Financing Costs   $ 17,729 $ 14,012      
Gain (Loss) on Contract Termination   280        
Transfer of Financial Assets Accounted for as Sales, Amount Derecognized $ 0 0     $ 78,006  
Long-term debt 1,374,611 1,374,611     1,196,300  
Revolving credit facility            
Long-term debt            
Line of Credit Facility, Maximum Borrowing Capacity 800,000 $ 800,000   $ 850,000 1,000,000  
Debt Instrument, Description of Variable Rate Basis   LIBOR        
Payments of Financing Costs   $ 633        
Deferred Finance Costs, Noncurrent, Net           $ 13,226
Letters of Credit Outstanding, Amount 30,152 30,152     27,240  
Line of Credit Facility, Remaining Borrowing Capacity 719,848 719,848        
Long-term debt 50,000 50,000     29,999  
Secured Debt [Member]            
Long-term debt            
Long-term debt 0 0     309,375  
Asset-backed Securities [Member]            
Long-term debt            
Line of Credit Facility, Maximum Borrowing Capacity $ 125,000 125,000   $ 225,000    
Line of Credit Facility, Commitment Fee Percentage 0.50%          
Line of Credit, Commitment Fee on Maximum Amount Available, Percentage 100.00%          
Line of Credit Facility, Amount Outstanding Commitment Fee, Percentage 0.13%          
Long-term debt $ 109,200 109,200     112,900  
Equipment leasing facility and other capital leases            
Long-term debt            
Long-term debt $ 58,297 58,297     72,800  
Senior notes due 2021 [Member]            
Long-term debt            
Debt instrument principal amount         $ 375,000  
Debt instrument interest rate stated percentage (as a percent)         4.875%  
Proceeds from loan, percentage of principal (as a percent) 100.00%          
Effective interest yield on principal amount (as a percent)         4.875%  
Long-term debt $ 375,000 375,000     $ 375,000  
Senior Notes Due 2022 [Member]            
Long-term debt            
Debt instrument principal amount         $ 300,000  
Debt instrument interest rate stated percentage (as a percent)         5.25%  
Proceeds from loan, percentage of principal (as a percent) 100.00%          
Effective interest yield on principal amount (as a percent)         5.25%  
Long-term debt $ 300,000 $ 300,000     $ 300,000  
Senior Notes Due 2025 [Member]            
Long-term debt            
Debt instrument interest rate stated percentage (as a percent) 7.75% 7.75%        
Payments of Financing Costs $ 8,779          
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 35.00%          
Debt Instrument, Redemption Price, Percentage 107.80%          
Debt Instrument, Repurchase Obligation Due to Change of Control, Percentage of Original Principal 100.00%          
Debt Instrument, Repurchase Obligation Due to Certain Asset Sales Percentage of Original Principal 100.00%          
Long-term debt $ 500,000 $ 500,000     0  
Notes Payable, Other Payables [Member]            
Long-term debt            
Long-term debt 0 0     7,978  
Receivables Purchase Agreement [Member]            
Long-term debt            
Line of Credit Facility, Maximum Borrowing Capacity 90,000 90,000        
Estimate of Fair Value Measurement [Member]            
Long-term debt            
Long-term debt 1,432,240 1,432,240     1,178,968  
Reported Value Measurement [Member]            
Long-term debt            
Long-term debt $ 1,374,611 $ 1,374,611     $ 1,196,300  
Minimum [Member] | Revolving credit facility            
Long-term debt            
Debt Instrument, Basis Spread on Variable Rate 1.50%          
Minimum [Member] | Receivables Purchase Agreement [Member]            
Long-term debt            
Line of Credit Facility, Amount Outstanding Commitment Fee, Percentage   0.65%        
Maximum [Member] | Revolving credit facility            
Long-term debt            
Debt Instrument, Basis Spread on Variable Rate 3.50%          
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.50%          
Maximum [Member] | Receivables Purchase Agreement [Member]            
Long-term debt            
Line of Credit Facility, Amount Outstanding Commitment Fee, Percentage   0.70%