Annual report pursuant to Section 13 and 15(d)

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

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Quarterly Selected Financial Data (Unaudited) (in thousands, except per share data) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Schedule of quarterly financial data
    First Quarter     Second Quarter     Third Quarter     Fourth Quarter  
    2017     2016     2017     2016     2017     2016     2017     2016  
Total revenue   $ 1,150,781     $ 1,077,632     $ 1,344,103     $ 1,186,835     $ 1,651,738     $ 1,484,736     $ 1,249,553     $ 1,125,137  
Operating income     119,734       131,282       275,071       227,018       476,820       413,614       177,194       153,550  
Net income     61,910       73,229       198,473       145,246       400,692       342,378       98,797       72,232  
Earnings per share:                                                                
Basic   $ 0.27     $ 0.32     $ 0.87     $ 0.64     $ 1.76     $ 1.51     $ 0.43     $ 0.32  
Diluted   $ 0.27     $ 0.32     $ 0.87     $ 0.64     $ 1.74     $ 1.50     $ 0.43     $ 0.32