LONG-TERM DEBT OBLIGATIONS, Convertible Senior Notes (Details) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2011	Jun. 25, 2012
LONG-TERM DEBT OBLIGATIONS [Abstract]
4.00% Convertible Senior Notes Aggregate Principal Amount				$ 105,000,000
Debt Issuance Cost for 4.00% Convertible Senior Notes		3,900
Net Proceeds From Issuance of 4.00% Convertible Senior Notes		101,062,000	0
4.00%, Interest Rate, Stated Percentage				4.00%
Amortization Period For Debt Issuance Cost Convertible Notes		7 years
Debt Instrument, Convertible, Shares per $1,000 principal amount of 4.00% Convertible Senior Notes				170.0319
Maximum Number of Shares Upon Conversion of the 4.00% Convertible Senior Notes				17,857,143
Debt Instrument, Convertible, Conversion Price				$ 5.88
Date Which Convertible Notes Will Become Redeemable				Jul. 01, 2017
Percentage Company's common stock has been above conversion price				130.00%
Number of Consecutive Trading Days Within Measurement Period				20
Number Of Consecutive Trading Days On Which Trading Price Is Examined For Triggering Of Conversion				30
Number of Trading Days to Trigger Measurement Period Within Date Company Provides Notice of Redemption				5
Percentage of Principal Amount That The Redemption Price Will Be Equal To				100.00%
Debt Instrument, 4.00% Convertible, Interest Expense	1,190,000	1,270,000
Aggregate Principal Amount of 3.50% Senior Convertible Notes Repurchased		91,614,000
Repayments of Convertible Debt excluding accrued interest		92,059,000
Debt Instrument, 3.50% Convertible, Interest Expense Paid with repurchase		445,000
Debt Related Commitment Fees and Debt Issuance Costs		262,000
3.50% Senior Convertible Notes Aggregate Principal Amount	3,855,000	3,855,000
Percentage of Principal Amount Holders Can Require Company To Repurchase Notes	100.00%	100.00%
Date Holders Of Notes Can Require Company Require Company To Repurchase	Jan. 15, 2013	Jan. 15, 2013
Debt Instrument, 3.50% Convertible, Interest Expense	$ 33,000	$ 1,071,000