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Quarterly Financial Information (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Revenues $ 275,784 $ 295,853 $ 289,414 $ 280,146 $ 265,732 $ 275,898 $ 263,204 $ 253,732 $ 1,141,198 $ 1,058,568 $ 948,626
Operating income (loss) 37,071 37,489 21,961 32,088 18,664 23,521 (15,596) 25,597 128,610 52,185 3,367
Income (loss) from continuing operations 17,689 11,778 (5,193) 5,921 (3,560) 923 (40,706) 2,500 30,196 (40,841) (63,051)
Income (loss) from discontinued operations, net of income taxes 7,279 (12,569) (23,885) (3,540) (6,522) (1,689) (8,607) 34,243 (32,735) 17,422 (195,251)
Net loss $ 24,968 $ (790) $ (29,077) $ 2,361 $ (10,082) $ (766) $ (49,313) $ 36,743 $ (2,539) $ (23,419) $ (258,302)
Income (loss) from continuing operations $ 0.28 [1] $ 0.19 [1] $ (0.08) [1] $ 0.10 [1] $ (0.05) [1] $ 0.02 [1] $ (0.67) [1] $ 0.04 [1] $ 0.49 $ (0.67) $ (1.05)
Income (loss) from discontinued operations, net of income taxes $ 0.12 [1] $ (0.20) [1] $ (0.39) [1] $ (0.06) [1] $ (0.11) [1] $ (0.03) [1] $ (0.14) [1] $ 0.57 [1] $ (0.53) $ 0.29 $ (3.25)
Net income (loss)- basic $ 0.40 [1] $ (0.01) [1] $ (0.47) [1] $ 0.04 [1] $ (0.16) [1] $ (0.01) [1] $ (0.81) [1] $ 0.61 [1] $ (0.04) $ (0.38) $ (4.30)
Income (loss) from continuing operations $ 0.28 [1] $ 0.19 [1] $ (0.08) [1] $ 0.10 [1] $ (0.05) [1] $ 0.02 [1] $ (0.67) [1] $ 0.04 [1] $ 0.48 $ (0.67) $ (1.05)
Income (loss) from discontinued operations, net of income taxes $ 0.12 [1] $ (0.20) [1] $ (0.39) [1] $ (0.06) [1] $ (0.11) [1] $ (0.03) [1] $ (0.14) [1] $ 0.56 [1] $ (0.52) $ 0.29 $ (3.25)
Net income (loss)- diluted $ 0.40 [1] $ (0.01) [1] $ (0.47) [1] $ 0.04 [1] $ (0.16) [1] $ (0.01) [1] $ (0.81) [1] $ 0.60 [1] $ (0.04) $ (0.38) $ (4.30)
[1] Net income (loss) per share calculations for each quarter is based on the weighted average number of shares outstanding during the respective periods; accordingly, the sum of the quarters may not equal the full-year income (loss) per share.