Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Schedule of Impact of Early Adoption (Details)

v3.6.0.2
Summary of Significant Accounting Policies - Schedule of Impact of Early Adoption (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 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
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
New Accounting Pronouncement, Early Adoption [Line Items]                        
Income tax expense     $ (106,310) $ (108,242)         $ (214,552) $ (345,727) $ (382,240) $ (337,545)
Net income $ 204,627 $ 193,901 $ 174,965 $ 172,440 $ 134,633 $ 166,550 $ 102,849 $ 105,692 $ 347,405 $ 745,933 $ 509,724 $ 493,241
Net income per common share--basic (in dollars per share) $ 0.04 $ 0.04 $ 0.04 $ 0.03 $ 0.03 $ 0.03 $ 0.02 $ 0.02 $ 0.07 $ 0.15 $ 0.09 $ 0.09
Net income per common share--diluted (in dollars per share) $ 0.04 $ 0.04 $ 0.04 $ 0.03 $ 0.03 $ 0.03 $ 0.02 $ 0.02 $ 0.07 $ 0.15 $ 0.09 $ 0.08
As reported                        
New Accounting Pronouncement, Early Adoption [Line Items]                        
Income tax expense     $ (108,260) $ (109,343)         $ (217,603)      
Net income     $ 173,015 $ 171,339         $ 344,354      
Net income per common share--basic (in dollars per share)     $ 0.04 $ 0.03         $ 0.07      
Net income per common share--diluted (in dollars per share)     $ 0.03 $ 0.03         $ 0.07