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CONSOLIDATED SUPPLEMENTARY FINANCIAL DATA (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Revenue:                      
Total revenue $ 57,443 [1] $ 57,530 [1] $ 56,215 $ 62,863 $ 83,359 $ 100,263 $ 66,214 $ 62,527 $ 234,051 $ 312,363 $ 323,390
Operating costs and expenses:                      
Total operating costs and expenses 61,470 [1],[2] 104,630 [1],[2] 77,964 [2] 80,421 [2] 101,493 [2] 89,527 [2] 68,722 [2] 54,157 [2] 324,485 313,899 96,508
Operating income (loss) (4,027) [1] (47,100) [1] (21,749) (17,558) (18,134) 10,736 (2,508) 8,370 (90,434) (1,536) 226,882
Net income (loss) $ (16,132) [1] $ (58,098) [1] $ (32,216) $ (27,890) $ (28,716) $ 478 $ (10,585) $ (4,230) $ (134,336) $ (43,053) $ 150,917
Net income (loss) per share:                      
Net income (loss) per share - basic (in dollars per share) $ (0.14) [1] $ (0.52) [1] $ (0.29) $ (0.25) $ (0.26) $ 0.00 $ (0.10) $ (0.04) $ (1.21) $ (0.39) $ 1.34
Net income (loss) per share - diluted (in dollars per share) $ (0.14) [1] $ (0.52) [1] $ (0.29) $ (0.25) $ (0.26) $ 0.00 $ (0.10) $ (0.04) $ (1.21) $ (0.39) $ 1.30
Shares used in per share calculations:                      
Basic (in shares) 111,332 [1] 110,826 [1] 110,553 110,358 110,171 112,334 109,992 107,613 110,769 110,041 112,456
Diluted (in shares) 111,332 [1] 110,826 [1] 110,553 110,358 110,171 115,552 109,992 107,613 110,769 110,041 115,884
[1] The quarterly financial information includes $6.6 million related to restructuring charges in the quarter ended September 30, 2012 and$0.7 million related to restructuring charges in the quarter ended December 31, 2012. Refer to Note 16, "Restructuring Charges" of Notes to Consolidated Financial Statements of this Form 10-K.
[2] The quarterly financial information includes $35.5 million related to the impairment of goodwill and long-lived assets in the quarter ended September 30, 2012. Refer to Note 6, "Intangible Assets and Goodwill" of Notes to Consolidated Financial Statements of this Form 10-K.