LONG-TERM DEBT (Tables)

12 Months Ended

Dec. 31, 2014

Debt Disclosure [Abstract]

Schedule of long-term debt

Long-term debt at December 31 consisted of the following (in thousands):

	2014		2013
5% Senior Notes, due September 2017 ($400 million principal amount; 5.1% effective rate)	$	399,244	$	398,961
7.875% Senior Notes, due August 2019 ($500 million principal amount; 8.0% effective rate)	498,500		498,171
4.875% Senior Notes, due June 2022 ($700 million principal amount; 4.6% effective rate)	711,640		713,208
4.75% Senior Notes, due January 2024 ($400 million principal amount; 4.8% effective rate)	399,631		—
5.4% Senior Notes, due December 2042 ($400 million principal amount; 5.4% effective rate)	398,417		398,360
5.85% Senior Notes, due January 2044 ($400 million principal amount; 5.9% effective rate)	399,892		—
Total long-term debt	$	2,807,324	$	2,008,700