XML 62 R52.htm IDEA: XBRL DOCUMENT v3.10.0.1
Income Taxes (Summary of Tax Expense and Effective Tax Rates) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Tax Disclosure [Abstract]        
Income before income taxes $ 37,377 $ 29,586 $ 64,589 $ 45,534
Income tax expense $ 3,000 $ 7,627 $ 13,758 $ 12,564
Effective tax rate (percent) 8.00% 25.80% 21.30% 27.60%