Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

v3.7.0.1
Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Income Taxes [Abstract]          
Income tax expense $ 9,879 $ 9,802 $ 10,539 $ 17,911  
Excess tax benefits recognized in income tax provision 5,700   18,300    
Valuation allowance $ 0   $ 0   $ 0