Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 13,378	$ 14,036
Basic EPS, Shares	83,309	83,292
Basic EPS, Per Share Amount	$ 0.16	$ 0.17
Effect of restricted stock	$ 0	$ 0
Effect of restricted stock, Shares	40	45
Diluted EPS, Net Income	$ 13,378	$ 14,036
Diluted EPS, Shares	83,349	83,337
Diluted EPS, Per Share Amount	$ 0.16	$ 0.17