LONG-TERM DEBT SCHEDULE OF LONG-TERM DEBT (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Total senior notes	$ 604,990	$ 601,329
Total credit facilities	37,000	75,250
Loans Payable, Noncurrent	15,000	0
Total long-term debt	656,990	676,579
Convertible Debt
Debt Instrument [Line Items]
Principal amount	115,000	115,000
Unamortized discount	(10,010)	(13,671)
3.25% Convertible senior notes due 2016, net of discount	104,990	101,329
7.75% Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
Senior Notes	500,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Corporate Line of Credit Outstanding	0	49,000
PDCM Credit Facility [Member]
Debt Instrument [Line Items]
PDCM Line of Credit Outstanding	37,000	26,250
PDCM Second Lien Term Loan [Member]
Debt Instrument [Line Items]
Loans Payable, Noncurrent	30,000
Convertible Debt
Debt Instrument [Line Items]
Principal amount	$ 165,400