XML 104 R88.htm IDEA: XBRL DOCUMENT v2.4.0.6
Selected Quarterly 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
Quarterly Financial Data [Abstract]                      
Revenues $ 56,603 $ 60,537 $ 66,325 $ 65,461 $ 68,946 $ 58,081 $ 55,589 $ 46,638 $ 248,926 $ 229,254 $ 127,921
Income from operations 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) 10,849 15,514 0 0 (91) 0 1 0 26,363 (90) 40
Net income $ 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