DEBT (Tables)

12 Months Ended

Dec. 31, 2017

DEBT [Abstract]

Debt

	Effective
in thousands	Interest Rates	2017	2016
Short-term Debt
Bank line of credit expires 2021 1, 2	n/a	$                  0	$                  0
Total short-term debt		$                  0	$                  0
Long-term Debt
Bank line of credit expires 20211, 2	1.25%	$       250,000	$       235,000
Term loan due 20182, 3	2.96%	350,000	0
7.00% notes due 2018	n/a	0	272,512
10.375% notes due 2018	n/a	0	250,000
Floating-rate notes due 2020	2.22%	250,000	0
7.50% notes due 2021	7.75%	35,111	600,000
8.85% notes due 2021	8.88%	6,000	6,000
Term loan due 20212	2.75%	250,000	0
4.50% notes due 2025	4.65%	400,000	400,000
3.90% notes due 2027	4.00%	400,000	0
7.15% notes due 2037	8.05%	240,188	240,188
4.50% notes due 2047	4.59%	700,000	0
Other notes 2	6.46%	230	365
Total long-term debt - face value		$    2,881,529	$    2,004,065
Unamortized discounts and debt issuance costs		(26,664)	(21,176)
Total long-term debt - book value		$    2,854,865	$    1,982,889
Less current maturities		41,383	138
Total long-term debt - reported value		$    2,813,482	$    1,982,751
Estimated fair value of long-term debt		$    2,983,419	$    2,243,213

1	Borrowings on the bank line of credit are classified as short-term debt if we intend to repay within twelve months and as long-term debt otherwise.
2	Non-publicly traded debt.
3	This short-term loan was refinanced on a long-term basis in February 2018 as discussed below.

Schedule of Principal and Interest Debt Payments

in thousands	Total	Principal	Interest
Debt Payments (excluding the line of credit)
2018	$      493,801	$     391,383	$     102,418
2019	111,068	12,523	98,545
2020	363,480	268,775	94,705
2021	308,537	218,526	90,011
2022	82,309	28	82,281

Standby Letters of Credit

in thousands
Standby Letters of Credit
Risk management insurance	$       38,111
Reclamation/restoration requirements	5,128
Total	$       43,239