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Selected Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | 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
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 55,000 | $ 56,603 | $ 60,537 | $ 66,325 | $ 65,461 | $ 68,946 | $ 58,081 | $ 55,589 | $ 46,638 | $ 248,926 | $ 229,254 | $ 127,921
INCOME (LOSS) FROM OPERATIONS | 14,944 | 25,875 | 18,178 | 25,947 | 27,263 | 31,585 | 29,118 | 28,156 | 22,105 | 97,263 | 110,964 | 50,754
Income tax expense (benefit) | 28,195 | 10,849 | 15,514 | 0 | 0 | (91) | 0 | 1 | 0 | 26,363 | (90) | 40
Net income | $ 44,559 | $ 15,883 | $ 502 | $ 25,117 | $ 26,869 | $ 30,974 | $ 29,009 | $ 27,265 | $ 21,174 | $ 68,371 | $ 108,422 | $ 47,363
Basic (usd per share) |  | $ 0.28 | $ 0.01 | $ 0.45 | $ 0.48 | $ 0.59 | $ 0.58 | $ 0.57 | $ 0.47 | $ 1.22 | $ 2.22 | $ 1.08
Diluted (usd per share) |  | $ 0.28 | $ 0.01 | $ 0.45 | $ 0.48 | $ 0.59 | $ 0.57 | $ 0.57 | $ 0.47 | $ 1.21 | $ 2.20 | $ 1.07

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