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Income Tax - Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Tax Disclosure [Abstract]        
Computed income tax at statutory rates     $ 29,902 $ 19,790
Differences in tax rates due to multiple jurisdictions     (356) 2,237
Tax benefit due to a change in estimate     0 (334)
Effect of income subject to tax-exemption grant     (19,542) (16,421)
Unrecognized tax expense (benefit)     754 (4,271)
Other (benefit) expense     (409) 247
Income tax expense (benefit) $ 3,302 $ (4,840) $ 10,349 $ 1,248