Annual report pursuant to Section 13 and 15(d)

Quarterly Selected Financial Data (Unaudited) (in thousands, except per share data) (Details)

v3.8.0.1
Quarterly Selected Financial Data (Unaudited) (in thousands, except per share data) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Total revenue $ 1,249,553 $ 1,651,738 $ 1,344,103 $ 1,150,781 $ 1,125,137 $ 1,484,736 $ 1,186,835 $ 1,077,632 $ 5,396,175 $ 4,874,340 $ 4,345,048
Operating income 177,194 476,820 275,071 119,734 153,550 413,614 227,018 131,282 1,048,819 925,464 702,486
Net income $ 98,797 $ 400,692 $ 198,473 $ 61,910 $ 72,232 $ 342,378 $ 145,246 $ 73,229 $ 759,872 $ 633,085 $ 427,137
Earnings per share                      
Basic (in dollars per share) $ 0.43 $ 1.76 $ 0.87 $ 0.27 $ 0.32 $ 1.51 $ 0.64 $ 0.32 $ 3.33 $ 2.79 $ 1.89
Diluted (in dollars per share) $ 0.43 $ 1.74 $ 0.87 $ 0.27 $ 0.32 $ 1.50 $ 0.64 $ 0.32 $ 3.31 $ 2.78 $ 1.86