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Income Tax Expense	9 Months Ended
Income Tax Expense	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Tax Expense	INCOME TAX EXPENSE The effective tax rates for the three months ended September 30, 2018 and 2017 were 29.8% and 15.0%, respectively, and for the nine months ended September 30, 2018 and 2017 were 21.7% and 14.7%, respectively. Income tax expense of $9.4 million in the third quarter of 2018 increased by $5.8 million compared to $3.6 million in the same period in 2017, due to the result of several items discrete to each quarter, along with changes in activity levels in jurisdictions with differing tax rates.