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LONG-TERM OBLIGATIONS (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Long-Term Obligations    
Long-term obligations gross including current maturities $ 777,573 $ 778,788
Current maturities of long-term obligations (5,590) (4,603)
Total long-term obligations 771,983 774,185
Deferred Finance Costs, Net, Total 1,335 1,448
Deferred debt issuance costs noncurrent 1,335 1,448
Long-term obligations including current maturities 776,238 777,340
Current maturities of long-term obligations (5,590) (4,603)
Long-term obligations, net of unamortized debt issuance costs 770,648 772,737
Aggregate long-term maturities, excluding capital lease obligations    
2017 5,116  
2018 79,672  
2019 2,348  
2020 85,846  
2021 1,848  
Thereafter 601,624  
Notes payable 0.61% - 16.00%, due in monthly and annual installments through 2025    
Long-Term Obligations    
Long-term obligations gross including current maturities 17,454 18,246
Long-term obligations including current maturities $ 17,454 $ 18,246
Notes payable 0.61% - 16.00%, due in monthly and annual installments through 2025 | Minimum    
Long-Term Obligations    
Interest rate on notes (as a percent) 0.61% 0.61%
Notes payable 0.61% - 16.00%, due in monthly and annual installments through 2025 | Maximum    
Long-Term Obligations    
Interest rate on notes (as a percent) 16.00% 16.00%
Senior unsecured notes 6.0%, due in 2018    
Long-Term Obligations    
Long-term obligations gross including current maturities $ 75,000 $ 75,000
Deferred Finance Costs, Net, Total 24 37
Long-term obligations including current maturities $ 74,976 $ 74,963
Interest rate on notes (as a percent) 6.00% 6.00%
Senior unsecured notes 3.8%, due in 2020    
Long-Term Obligations    
Long-term obligations gross including current maturities $ 84,000 $ 84,000
Deferred Finance Costs, Net, Total 105 119
Long-term obligations including current maturities $ 83,895 $ 83,881
Interest rate on notes (as a percent) 3.80% 3.80%
Senior unsecured notes 3.2%, due in 2022    
Long-Term Obligations    
Long-term obligations gross including current maturities $ 75,000 $ 75,000
Deferred Finance Costs, Net, Total 126 138
Long-term obligations including current maturities $ 74,874 $ 74,862
Interest rate on notes (as a percent) 3.20% 3.20%
Senior unsecured notes 3.5%, due in 2023    
Long-Term Obligations    
Long-term obligations gross including current maturities $ 125,000 $ 125,000
Deferred Finance Costs, Net, Total 238 256
Long-term obligations including current maturities $ 124,762 $ 124,744
Interest rate on notes (as a percent) 3.50% 3.50%
Senior unsecured notes 3.4%, due in 2024    
Long-Term Obligations    
Long-term obligations gross including current maturities $ 50,000 $ 50,000
Deferred Finance Costs, Net, Total 97 104
Long-term obligations including current maturities $ 49,903 $ 49,896
Interest rate on notes (as a percent) 3.40% 3.40%
Senior unsecured notes 3.5%, due in 2024    
Long-Term Obligations    
Long-term obligations gross including current maturities $ 100,000 $ 100,000
Deferred Finance Costs, Net, Total 238 256
Long-term obligations including current maturities $ 99,762 $ 99,744
Interest rate on notes (as a percent) 3.50% 3.50%
Senior unsecured notes 3.6%, due in 2025    
Long-Term Obligations    
Long-term obligations gross including current maturities $ 125,000 $ 125,000
Deferred Finance Costs, Net, Total 254 269
Long-term obligations including current maturities $ 124,746 $ 124,731
Interest rate on notes (as a percent) 3.60% 3.60%
Senior unsecured notes 3.6%, due in 2026    
Long-Term Obligations    
Long-term obligations gross including current maturities $ 125,000 $ 125,000
Deferred Finance Costs, Net, Total 254 269
Long-term obligations including current maturities $ 124,746 $ 124,731
Interest rate on notes (as a percent) 3.60% 3.60%
Capital lease obligations    
Long-Term Obligations    
Long-term obligations gross including current maturities $ 1,119 $ 1,542
Long-term obligations including current maturities $ 1,119 $ 1,542