XML 83 R69.htm IDEA: XBRL DOCUMENT v3.6.0.2
Summarized Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Selected Quarterly Financial Information [Abstract]                      
Revenues $ 119,279 $ 102,156 $ 108,487 $ 111,166 $ 113,660 $ 99,142 $ 109,750 $ 111,885 $ 441,088 $ 434,437 $ 446,041
Income from operations 19,654 4,830 12,896 20,092 21,656 7,254 20,929 19,859 57,472 69,698 81,747
Net income $ 11,718 $ 2,878 $ 7,786 $ 12,420 $ 13,041 $ 3,723 $ 11,874 $ 11,385 $ 34,802 $ 40,023 $ 46,356
Net income per share:                      
Basic $ 1.10 $ 0.27 $ 0.73 $ 1.17 $ 1.23 $ 0.35 $ 1.12 $ 1.08 $ 3.28 $ 3.78 $ 4.39
Diluted $ 1.07 $ 0.27 $ 0.72 $ 1.15 $ 1.21 $ 0.35 $ 1.11 $ 1.06 $ 3.21 $ 3.73 $ 4.35