Quarterly report pursuant to Section 13 or 15(d)

Earnings per Share (Details)

v3.5.0.2
Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Sep. 30, 2015
Jun. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
Numerator:              
Net income available to common stockholders for basic and diluted net income per common share $ 193,901 $ 174,965 $ 172,440 $ 166,550 $ 347,405 $ 541,306 $ 375,091
Denominator:              
Weighted average common shares outstanding for basic net income per common share (in shares) 4,870,281     5,297,797   4,957,820 5,436,378
Weighted average impact of dilutive equity instruments (in shares) 49,548     48,641   47,313 50,738
Weighted average shares for diluted net income per common share (in shares) 4,919,829     5,346,438   5,005,133 5,487,116
Net income per common share:              
Basic (in dollars per share) $ 0.04 $ 0.04 $ 0.03 $ 0.03 $ 0.07 $ 0.11 $ 0.07
Diluted (in dollars per share) $ 0.04 $ 0.04 $ 0.03 $ 0.03 $ 0.07 $ 0.11 $ 0.07