Annual report pursuant to Section 13 and 15(d)

LONG-TERM DEBT (Schedule of Debt Interest Expense) (Details)

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LONG-TERM DEBT (Schedule of Debt Interest Expense) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]      
Contractual interest coupon $ 111,659 $ 123,740 $ 120,414
2.875% Convertible Senior Notes Due 2027 [Member]
      
Debt Instrument [Line Items]      
Contractual interest coupon 6,325 6,325 6,325
Amortization of debt discount 12,995 11,792 10,700
Amortization of debt issuance costs 703 703 703
Total interest cost recognized on the notes $ 20,023 $ 18,820 $ 17,728