Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Income Taxes          
Effective tax rate (as a percent) 25.50% 38.10% 21.30% 34.40%  
Tax (expense) benefit related to share-based compensation $ (19) $ 338 $ 2,595 $ 1,166  
Net deferred tax liability 151,000   151,000    
Net long-term deferred tax assets 17,634   17,634   $ 18,129
Net long-term deferred tax liabilities $ 168,590   $ 168,590   $ 132,840