DEBT (Tables)

9 Months Ended

Sep. 30, 2017

DEBT [Abstract]

Debt

	Effective	September 30	December 31	September 30
in thousands	Interest Rates	2017	2016	2016
Short-term Debt
Bank line of credit expires 20211, 2, 3	n/a	$                  0	$                0	$                0
Total short-term debt		$                  0	$                0	$                0
Long-term Debt
Bank line of credit expires 20211, 2, 3	n/a	$                  0	$     235,000	$     235,000
7.00% notes due 2018	n/a	0	272,512	272,512
10.375% notes due 2018	n/a	0	250,000	250,000
Floating-rate notes due 2020	2.13%	250,000	0	0
7.50% notes due 2021	7.75%	600,000	600,000	600,000
8.85% notes due 2021	8.88%	6,000	6,000	6,000
Term loan due 20212, 3	2.49%	250,000	0	0
4.50% notes due 2025	4.65%	400,000	400,000	400,000
3.90% notes due 2027	4.00%	400,000	0	0
7.15% notes due 2037	8.05%	240,188	240,188	240,188
4.50% notes due 2047	4.59%	700,000	0	0
Other notes 3	6.31%	353	365	484
Total long-term debt - face value		$    2,846,541	$  2,004,065	$  2,004,184
Unamortized discounts and debt issuance costs		(31,748)	(21,176)	(20,414)
Total long-term debt - book value		$    2,814,793	$  1,982,889	$  1,983,770
Less current maturities		4,827	138	131
Total long-term debt - reported value		$    2,809,966	$  1,982,751	$  1,983,639
Estimated fair value of long-term debt		$    3,068,236	$  2,243,213	$  2,305,065

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	The effective interest rate is the spread over LIBOR as of the most recent balance sheet date.
3	Non-publicly traded debt.

Standby Letters of Credit

in thousands
Standby Letters of Credit
Risk management insurance	$       38,111
Reclamation/restoration requirements	5,177
Total	$       43,288