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Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2012 | Mar. 31, 2011 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Consolidated Statements Of Income [Abstract] |  |  |  |  |
Revenues, net | $ 326,239 | $ 272,903 | $ 1,187,741 | $ 1,078,300 | $ 973,644
Operating expenses: |  |  |  |  |
Technical and operating | 104,930 | 90,411 | 425,961 | 366,093 | 310,365
Selling, general and administrative | 99,222 | 86,921 | 335,656 | 328,134 | 313,904
Restructuring (credit) expense | (3) | (34) | (240) | (2,218) | 5,162
Depreciation and amortization | 25,051 | 24,926 | 99,848 | 106,455 | 106,504
Total operating expenses | 229,200 | 202,224 | 861,225 | 798,464 | 735,935
Operating income | 97,039 | 70,679 | 326,516 | 279,836 | 237,709
Other income (expense): |  |  |  |  |
Interest expense | (29,797) | (18,350) | (95,870) | (75,800) | (79,778)
Interest income | 105 | 457 | 1,074 | 2,388 | 836
Write-off of deferred financing costs | (312) |  | (6,247) |  |
Loss on extinguishment of debt |  |  | (14,726) |  |
Miscellaneous, net | 12 | 72 | (137) | (162) | 187
Total non-operating income (expense) | (29,992) | (17,821) | (115,906) | (73,574) | (78,755)
Income from continuing operations before income taxes | 67,047 | 52,858 | 210,610 | 206,262 | 158,954
Income tax expense | (23,970) | (23,136) | (84,248) | (88,073) | (70,407)
Income from continuing operations | 43,077 | 29,722 | 126,362 | 118,189 | 88,547
Income (loss) from discontinued operations, net of income taxes | 104 | 96 | 92 | (38,090) | (34,791)
Net income | $ 43,181 | $ 29,818 | $ 126,454 | $ 80,099 | $ 53,756
Basic net income per share: |  |  |  |  |
Income from continuing operations | $ 0.62 | $ 0.43 | $ 1.82 | $ 1.71 | $ 1.28
Income (loss) from discontinued operations |  |  |  | $ (0.55) | $ (0.50)
Net income | $ 0.62 | $ 0.43 | $ 1.83 | $ 1.16 | $ 0.78
Diluted net income per share: |  |  |  |  |
Income from continuing operations | $ 0.60 | $ 0.43 | $ 1.79 | $ 1.71 | $ 1.28
Income (loss) from discontinued operations |  |  |  | $ (0.55) | $ (0.50)
Net income | $ 0.60 | $ 0.43 | $ 1.79 | $ 1.16 | $ 0.78
Weighted average common shares: |  |  |  |  |
Basic weighted average common shares | 69,871 | 69,161 | 69,283 | 69,161 | 69,161
Diluted weighted average common shares | 72,130 | 69,161 | 70,731 | 69,161 | 69,161

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