NET INCOME PER COMMON SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Earnings Per Share, Basic and Diluted [Abstract]
Net Income (Loss) Attributable to Parent	$ 8,177	$ 8,231	$ 3,921	$ 57,986	$ 68,510
Weighted Average Number Of Shares Outstanding Basic	36,735,215	36,366,675	36,704,001	36,355,024
Earnings Per Share Basic	$ 0.22	$ 0.23	$ 0.11	$ 1.59
Incremental Common Shares Attributable to Share-based Payment Arrangements	812,430	1,096,410	958,183	1,470,473
Weighted Average Number Of Diluted Shares Outstanding	37,547,645	37,463,085	37,662,184	37,825,497
Earnings Per Share Diluted	$ 0.22	$ 0.22	$ 0.10	$ 1.53
Options Activity [Member]
Impact Of Equity Awards [Line Items]
Excluded shares as anti-dilutive under the treasury stock method	49	53	51	54
Price range of option: from	$ 6.34	$ 6.67	$ 6.36	$ 9.02
Price range of option: to	$ 48.21	$ 48.21	$ 48.21	$ 48.21
Restricted Stock Units Activity [Member]
Impact Of Equity Awards [Line Items]
Excluded shares as anti-dilutive under the treasury stock method	1,156	1,176	1,309	1,142
Restricted Stock Units Activity [Member] | Restricted Stock Units Service Conditions [Member]
Impact Of Equity Awards [Line Items]
Excluded shares as anti-dilutive under the treasury stock method	956	976	1,109	942
Restricted Stock Units Activity [Member] | Restricted Stock Units Service And Market Conditions But Market Not Met [Member]
Impact Of Equity Awards [Line Items]
Excluded shares as anti-dilutive under the treasury stock method	200	200	200	200