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Income Tax Expense	3 Months Ended
Income Tax Expense	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Tax Expense	INCOME TAX EXPENSE The effective tax rates for the three months ended March 31, 2018 and 2017 were 18% and 14%, respectively. Income tax expense of $5.3 million in the first quarter of 2018 increased by $2.4 million compared to $2.9 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.